[ { "id": "https://authors.library.caltech.edu/records/ezez9-jyk89", "eprint_status": "archive", "datestamp": "2024-01-26 22:38:05", "lastmod": "2024-01-26 22:38:05", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Esin-Iliya", "name": { "family": "Esin", "given": "Iliya" }, "orcid": "0000-0003-2959-0617" }, { "id": "Kuhlenkamp-Clemens", "name": { "family": "Kuhlenkamp", "given": "Clemens" }, "orcid": "0000-0001-5529-4358" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Berg-Erez", "name": { "family": "Berg", "given": "Erez" }, "orcid": "0000-0001-8956-3384" }, { "id": "Rudner-Mark-S", "name": { "family": "Rudner", "given": "Mark S." }, "orcid": "0000-0002-5150-6234" }, { "id": "Lindner-Netanel-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" } ] }, "title": "Universal transport in periodically driven systems without long-lived quasiparticles", "ispublished": "pub", "full_text_status": "public", "keywords": "General Physics and Astronomy", "note": "
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
\n\n ", "abstract": "An intriguing regime of universal charge transport at high entropy density has been proposed for periodically driven interacting one-dimensional systems with Bloch bands separated by a large single-particle band gap. For weak interactions, a simple picture based on well-defined Floquet quasiparticles suggests that the system should host a quasisteady state current that depends only on the populations of the system's Floquet-Bloch bands and their associated quasienergy winding numbers. Here we show that such topological transport persists into the strongly interacting regime where the single-particle lifetime becomes shorter than the drive period. Analytically, we show that the value of the current is insensitive to interaction-induced band renormalizations and lifetime broadening when certain conditions are met by the system's nonequilibrium distribution function. We show that these conditions correspond to a quasisteady state. We support these predictions through numerical simulation of a system of strongly interacting fermions in a periodically modulated chain of Sachdev-Ye-Kitaev dots. Our paper establishes universal transport at high entropy density as a robust far from equilibrium topological phenomenon, which can be readily realized with cold atoms in optical lattices.
", "date": "2024-01", "date_type": "published", "publication": "Physical Review Research", "volume": "6", "number": "1", "publisher": "American Physical Society", "pagerange": "013094", "issn": "2643-1564", "official_url": "https://authors.library.caltech.edu/records/ezez9-jyk89", "funders": { "items": [ { "grant_number": "639172" }, { "grant_number": "678862" }, {}, {}, { "grant_number": "DE-SC0019166" }, {}, { "grant_number": "Institute of Quantum Information and Matter" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/physrevresearch.6.013094", "primary_object": { "basename": "PhysRevResearch.6.013094.pdf", "url": "https://authors.library.caltech.edu/records/ezez9-jyk89/files/PhysRevResearch.6.013094.pdf" }, "related_objects": [ { "basename": "MoviesLegends.pdf", "url": "https://authors.library.caltech.edu/records/ezez9-jyk89/files/MoviesLegends.pdf" }, { "basename": "TimeEvolutionLesserFunction.mp4", "url": "https://authors.library.caltech.edu/records/ezez9-jyk89/files/TimeEvolutionLesserFunction.mp4" }, { "basename": "TimeEvolutionSpectralFunction.mp4", "url": "https://authors.library.caltech.edu/records/ezez9-jyk89/files/TimeEvolutionSpectralFunction.mp4" } ], "resource_type": "article", "pub_year": "2024", "author_list": "Esin, Iliya; Kuhlenkamp, Clemens; et el." }, { "id": "https://authors.library.caltech.edu/records/kghgg-2cw05", "eprint_status": "archive", "datestamp": "2023-12-11 18:58:37", "lastmod": "2023-12-11 18:58:37", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Khor-Brian-J-J", "name": { "family": "Khor", "given": "Brian J. J." } }, { "id": "Wampler-Matthew", "name": { "family": "Wampler", "given": "Matthew" }, "orcid": "0000-0001-6303-3561" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Klich-Israel", "name": { "family": "Klich", "given": "Israel" }, "orcid": "0000-0002-8979-0170" } ] }, "title": "Measurement-induced chirality: Diffusion and disorder", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2023 American Physical Society.
\n\nThe work of I.K., B.J.J.K., and M.W. was supported in part by the NSF Grant No. DMR-1918207. G.R. acknowledges support from the Institute of Quantum Information and Matter, an NSF Physics Frontiers Center funded by the Gordon and Betty Moore Foundation, and the Simons Foundation.
", "abstract": "Repeated quantum measurements can generate effective new nonequilibrium dynamics in matter. Here we combine such a measurement driven system with disorder. In particular, we investigate the diffusive behavior in the system and the effect of various types of disorder on the measurement induced chiral transport protocol. We begin by characterizing the diffusive behavior produced by the measurements themselves in a clean system. We then examine the edge flow of particles per measurement cycle for three different types of disorder: site dilution, lattice distortion, and disorder in on-site chemical potential. In the quantum Zeno limit, the effective descriptions for the disordered measurement system with lattice distortions and random on-site potential can be modeled as a classical stochastic model, and the overall effect of increasing these disorders induces a crossover from perfect flow to zero transport. On the other hand if vacancies are present in the lattice the flow of particles per measurement cycle undergoes a percolation phase transition from unity to zero with percolation threshold p\ua700 \u2248 0.26, with critical exponent \u03bd \u2248 1.35. We also present numerical results away from Zeno limit and note that the overall effect of moving away from the Zeno effect is to reduce particle flow per cycle when the measurement frequency in our protocol is reduced.
", "date": "2023-12-01", "date_type": "published", "publication": "Physical Review B", "volume": "108", "number": "21", "publisher": "American Physical Society", "pagerange": "214305", "issn": "2469-9950", "official_url": "https://authors.library.caltech.edu/records/kghgg-2cw05", "funders": { "items": [ { "grant_number": "DMR-1918207" }, {}, {} ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/physrevb.108.214305", "primary_object": { "basename": "PhysRevB.108.214305.pdf", "url": "https://authors.library.caltech.edu/records/kghgg-2cw05/files/PhysRevB.108.214305.pdf" }, "resource_type": "article", "pub_year": "2023", "author_list": "Khor, Brian J. J.; Wampler, Matthew; et el." }, { "id": "https://authors.library.caltech.edu/records/za6mp-a9645", "eprint_status": "archive", "datestamp": "2023-12-01 21:14:44", "lastmod": "2023-12-01 21:14:44", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "O'Brien-Liam", "name": { "family": "O'Brien", "given": "Liam" }, "orcid": "0000-0002-8603-1347" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Probing localization properties of many-body Hamiltonians via an imaginary vector potential", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2023 American Physical Society.
\n\nL.O.B. and G.R. thank David Huse for useful discussion regarding the distinction between single and multi l-bit flips when defining A_\u2113. L.O.B. also thanks Christopher David White for his guidance and advice during the early stages of this project, as well as Dan Borgnia for useful discussions. G.R. is grateful for support from the Simons Foundation as well as support from the NSF DMR Grant No. 1839271, and from the IQIM, an NSF Physics Frontiers Center. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.
", "abstract": "Identifying and measuring the \"localization length\" in many-body systems in the vicinity of a many-body localization transition is difficult. Following Hatano and Nelson, a recent paper [S. Heu\u00dfen, C. D. White, and G. Refael, Phys. Rev. B 103, 064201 (2021)] introduced an \"imaginary vector potential\" to a disordered ring of interacting fermions, in order to define a many-body localization length (corresponding, in the noninteracting case, to the end-to-end Green's function of the Hermitian system). We extend these results, by connecting this localization length to the length scale appearing in the avalanche model of delocalization. We use this connection to derive the distribution of the localization length at the MBL transition, finding good agreement with our numerical observations. Our results demonstrate how a localization length defined as such probes the localization of the underlying ring, without the need to explicitly construct the l-bits.
", "date": "2023-11-01", "date_type": "published", "publication": "Physical Review B", "volume": "108", "number": "18", "publisher": "American Physical Society", "pagerange": "184207", "issn": "2469-9950", "official_url": "https://authors.library.caltech.edu/records/za6mp-a9645", "funders": { "items": [ {}, { "grant_number": "DMR-1839271" }, { "grant_number": "PHY-1607611" }, { "agency": "Institute for Quantum Information and Matter, California Institute of Technology" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/physrevb.108.184207", "primary_object": { "basename": "PhysRevB.108.184207.pdf", "url": "https://authors.library.caltech.edu/records/za6mp-a9645/files/PhysRevB.108.184207.pdf" }, "resource_type": "article", "pub_year": "2023", "author_list": "O'Brien, Liam and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/pjtpz-rsh54", "eprint_status": "archive", "datestamp": "2023-11-02 19:17:32", "lastmod": "2023-11-02 19:19:04", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "name": { "family": "Psaroudaki", "given": "Christina" }, "orcid": "0000-0002-7073-6422" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Energy transfer in random-matrix ensembles of Floquet Hamiltonians", "ispublished": "pub", "full_text_status": "public", "keywords": "Floquet systems; Machine learning", "note": "An article within the collection: Emmanuel Rashba: Breaking New Ground in Solid-State Exploration
\n\nWe thank A. Chandran and M. Kolodrubetz for useful discussions. C.P. has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sk\u0142odowska-Curie Grant Agreement No. 839004. We are also grateful to the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. de-sc0019166. G.R. is also grateful to the NSF DMR Grant No. 1839271, as well as ARO MURI Grant No. FA9550-22-1-0339 supported G.R.'s time commitment to the project in equal shares. NSF provided partial support to C.P. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611. G.R. is also grateful for support from the Simons Foundation and the Packard Foundation.
\n\n\u00a92023 American Physical Society
\n\nPublished article: PhysRevB.108.064301.pdf
", "abstract": "We explore the statistical properties of energy transfer in ensembles of doubly driven random-matrix Floquet Hamiltonians based on universal symmetry arguments. The energy-pumping efficiency distribution P(E\u0305) is associated with the Hamiltonian parameter ensemble and the eigenvalue statistics of the Floquet operator. For specific Hamiltonian ensembles, P(E\u0305) undergoes a transition which cannot be associated with a symmetry breaking of the instantaneous Hamiltonian. The Floquet eigenvalue spacing distribution indicates the considered ensembles constitute generic nonintegrable Hamiltonian families. As a step towards Hamiltonian engineering, we develop a machine-learning classifier to understand the relative parameter importance in resulting high-conversion efficiency. We propose random Floquet Hamiltonians as a general framework to investigate frequency conversion effects in a class of generic dynamical processes beyond adiabatic pumps.
", "date": "2023-08-01", "date_type": "published", "publication": "Physical Review B", "volume": "108", "number": "6", "publisher": "American Physical Society (APS)", "pagerange": "064301", "issn": "2469-9950", "official_url": "https://authors.library.caltech.edu/records/pjtpz-rsh54", "funders": { "items": [ { "grant_number": "839004" }, { "grant_number": "de-sc0019166" }, {}, { "grant_number": "1839271" }, { "grant_number": "PHY-1607611" }, {}, {} ] }, "doi": "10.1103/physrevb.108.064301", "primary_object": { "basename": "PhysRevB.108.064301.pdf", "url": "https://authors.library.caltech.edu/records/pjtpz-rsh54/files/PhysRevB.108.064301.pdf" }, "resource_type": "article", "pub_year": "2023", "author_list": "Psaroudaki, Christina and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/s94x6-j8151", "eprint_status": "archive", "datestamp": "2023-10-13 21:55:33", "lastmod": "2023-10-13 21:55:33", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Yang-Christopher", "name": { "family": "Yang", "given": "Christopher" }, "orcid": "0000-0002-9462-9074" }, { "id": "Esin-Iliya", "name": { "family": "Esin", "given": "Iliya" }, "orcid": "0000-0003-2959-0617" }, { "id": "Lewandowski-Cyprian", "name": { "family": "Lewandowski", "given": "Cyprian" }, "orcid": "0000-0002-6944-9805" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Optical Control of Slow Topological Electrons in Moir\u00e9 Systems", "ispublished": "pub", "full_text_status": "public", "keywords": "General Physics and Astronomy", "note": "\u00a9 2023 American Physical Society.
\n\nWe thank Netanel Lindner, Mark Rudner, Or Katz, Gaurav Gupta, Seamus O'Hara, Jason Alicea, Alex Thomson, Felix von Oppen, Kry\u0161tof Kol\u00e1\u0159, \u00c9tienne Lantagne-Hurtubise, and Valerio Peri for valuable discussions. C.\u2009Y. gratefully acknowledges support from the DOE NNSA Stewardship Science Graduate Fellowship program, which is provided under cooperative Agreement No. DE-NA0003960. C.\u2009L. acknowledges support by the Gordon and Betty Moore Foundation's EPiQS Initiative, Grant GBMF8682, start-up funds from Florida State University and the National High Magnetic Field Laboratory. The National High Magnetic Field Laboratory is supported by the National Science Foundation through NSF/DMR-1644779 and the State of Florida. G.\u2009R. and I.\u2009E. are grateful for support from the Simons Foundation and the Institute of Quantum Information and Matter, as well as support from the NSF DMR Grant No. 1839271. This work is supported by ARO MURI Grant No. W911NF-16-1-0361, and was performed in part at the Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.
", "abstract": "Floquet moir\u00e9 materials possess optically-induced flat-electron bands with steady-states sensitive to drive parameters. Within this regime, we show that strong interaction screening and phonon bath coupling can overcome enhanced drive-induced heating. In twisted bilayer graphene (TBG) irradiated by a terahertz-frequency continuous circularly polarized laser, the extremely slow electronic states enable the drive to control the steady state occupation of high-Berry curvature electronic states. In particular, above a critical field amplitude, high-Berry-curvature states exhibit a slow regime where they decouple from acoustic phonons, allowing the drive to control the anomalous Hall response. Our work shows that the laser-induced control of topological and transport physics in Floquet TBG are measurable using experimentally available probes.
", "date": "2023-07-14", "date_type": "published", "publication": "Physical Review Letters", "volume": "131", "number": "2", "publisher": "American Physical Society", "pagerange": "026901", "issn": "0031-9007", "official_url": "https://authors.library.caltech.edu/records/s94x6-j8151", "funders": { "items": [ { "grant_number": "DE-NA0003960" }, { "grant_number": "GBMF8682" }, {}, { "agency": "National High Magnetic Field Laboratory" }, { "grant_number": "PHY-1607611" }, {}, { "agency": "Institute for Quantum Information and Matter, California Institute of Technology" }, { "grant_number": "DMR-1839271" }, { "grant_number": "W911NF-16-1-0361" }, { "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/physrevlett.131.026901", "primary_object": { "basename": "PhysRevLett.131.026901.pdf", "url": "https://authors.library.caltech.edu/records/s94x6-j8151/files/PhysRevLett.131.026901.pdf" }, "related_objects": [ { "basename": "supplement.pdf", "url": "https://authors.library.caltech.edu/records/s94x6-j8151/files/supplement.pdf" } ], "resource_type": "article", "pub_year": "2023", "author_list": "Yang, Christopher; Esin, Iliya; et el." }, { "id": "https://authors.library.caltech.edu/records/59pd4-ke593", "eprint_id": 121428, "eprint_status": "archive", "datestamp": "2023-08-22 20:38:34", "lastmod": "2023-10-20 15:28:09", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Esin-Iliya", "name": { "family": "Esin", "given": "Iliya" }, "orcid": "0000-0003-2959-0617" }, { "id": "Esterlis-Ilya", "name": { "family": "Esterlis", "given": "Ilya" }, "orcid": "0000-0003-4775-9105" }, { "id": "Demler-Eugene-A", "name": { "family": "Demler", "given": "Eugene" }, "orcid": "0000-0002-2499-632X" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Generating Coherent Phonon Waves in Narrow-Band Materials: A Twisted Bilayer Graphene Phaser", "ispublished": "pub", "full_text_status": "public", "keywords": "General Physics and Astronomy", "note": "\u00a9 2023 American Physical Society. \n\nWe thank Kenneth Burch, Jerome Faist, Mohammad Hafezi, Atac Imamoglu, Cyprian Lewandowski, Marios Michael, Leo Radzihovsky, and Christopher Yang for valuable discussions. G.\u2009R. and I.\u2009Esin are grateful for support from the Simons Foundation and the Institute of Quantum Information and Matter, as well as support from the NSF DMR Grant No. 1839271. E.\u2009D. and I.\u2009Esterlis acknowledge support from the ARO grant \"Control of Many-Body States Using Strong Coherent Light-Matter Coupling in Terahertz Cavities.\" This work is supported by ARO MURI Grant No. W911NF-16-1-0361, and was performed in part at Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.\n\nPublished - PhysRevLett.130.147001.pdf
Supplemental Material - SupplementaryMaterial.pdf
", "abstract": "Twisted bilayer graphene (TBG) exhibits extremely low Fermi velocities for electrons, with the speed of sound surpassing the Fermi velocity. This regime enables the use of TBG for amplifying vibrational waves of the lattice through stimulated emission, following the same principles of operation of free-electron lasers. Our Letter proposes a lasing mechanism relying on the slow-electron bands to produce a coherent beam of acoustic phonons. We propose a device based on undulated electrons in TBG, which we dub the phaser. The device generates phonon beams in a terahertz (THz) frequency range, which can then be used to produce THz electromagnetic radiation. The ability to generate coherent phonons in solids breaks new ground in controlling quantum memories, probing quantum states, realizing nonequilibrium phases of matter, and designing new types of THz optical devices.", "date": "2023-04-07", "date_type": "published", "publication": "Physical Review Letters", "volume": "130", "number": "14", "publisher": "American Physical Society", "pagerange": "Art. No. 147001", "id_number": "CaltechAUTHORS:20230518-332288000.2", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230518-332288000.2", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Simons Foundation" }, { "agency": "NSF", "grant_number": "DMR-1839271" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "Institute for Quantum Information and Matter" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/physrevlett.130.147001", "primary_object": { "basename": "PhysRevLett.130.147001.pdf", "url": "https://authors.library.caltech.edu/records/59pd4-ke593/files/PhysRevLett.130.147001.pdf" }, "related_objects": [ { "basename": "SupplementaryMaterial.pdf", "url": "https://authors.library.caltech.edu/records/59pd4-ke593/files/SupplementaryMaterial.pdf" } ], "resource_type": "article", "pub_year": "2023", "author_list": "Esin, Iliya; Esterlis, Ilya; et el." }, { "id": "https://authors.library.caltech.edu/records/e28ry-gkg44", "eprint_id": 117940, "eprint_status": "archive", "datestamp": "2023-08-22 17:51:54", "lastmod": "2023-10-23 20:11:19", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Nathan-Frederik", "name": { "family": "Nathan", "given": "Frederik" }, "orcid": "0000-0001-9700-0231" }, { "id": "Martin-Ivar", "name": { "family": "Martin", "given": "Ivar" }, "orcid": "0000-0002-2010-6449" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Topological frequency conversion in Weyl semimetals", "ispublished": "pub", "full_text_status": "public", "keywords": "General Physics and Astronomy", "note": "We thank N. Peter Armitage, Chris Ciccarino, Cyprian Lewandowski, Prineha Narang, and Mark Rudner for valuable discussions. F.N. gratefully acknowledges the support of the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 678862) and the Villum Foundation. I.M. was supported by the Materials Sciences and Engineering Division, Basic Energy Sciences, Office of Science, U.S. Department of Energy. G.R. is grateful for support from the Simons Foundation as well as support from the NSF DMR Grant No. 1839271, and this work is supported by ARO MURI Grant No. W911NF-16-1-0361. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607611.", "abstract": "We theoretically predict a working principle for optical amplification, based on Weyl semimetals: When a Weyl semimetal is suitably irradiated at two frequencies, electrons close to the Weyl points convert energy between the frequencies through the mechanism of topological frequency conversion from [Martin et al., Phys. Rev. X 7, 041008 (2017)]. Each electron converts energy at a quantized rate given by an integer multiple of Planck's constant multiplied by the product of the two frequencies. In simulations, we show that optimal, but feasible band structures, can support topological frequency conversion in the \"THz gap\" at intensities down to 2 W/mm\u00b2; the gain from the effect can exceed the dissipative loss when the frequencies are larger than the relaxation time of the system. Topological frequency conversion forms a paradigm for optical amplification, which further extends Weyl semimetals' promise for technological applications.", "date": "2022-10", "date_type": "published", "publication": "Physical Review Research", "volume": "4", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 043060", "id_number": "CaltechAUTHORS:20221121-712406200.5", "issn": "2643-1564", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20221121-712406200.5", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "European Research Council (ERC)", "grant_number": "678862" }, { "agency": "Villum Foundation" }, { "agency": "Department of Energy (DOE)" }, { "agency": "Simons Foundation" }, { "agency": "NSF", "grant_number": "DMR-1839271" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/physrevresearch.4.043060", "resource_type": "article", "pub_year": "2022", "author_list": "Nathan, Frederik; Martin, Ivar; et el." }, { "id": "https://authors.library.caltech.edu/records/202s5-wxx58", "eprint_id": 118383, "eprint_status": "archive", "datestamp": "2023-08-22 17:46:02", "lastmod": "2023-10-24 23:20:09", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zhang-Yiran", "name": { "family": "Zhang", "given": "Yiran" }, "orcid": "0000-0002-8477-0074" }, { "id": "Polski-Robert-M", "name": { "family": "Polski", "given": "Robert" }, "orcid": "0000-0003-0887-8099" }, { "id": "Lewandowski-Cyprian", "name": { "family": "Lewandowski", "given": "Cyprian" }, "orcid": "0000-0002-6944-9805" }, { "id": "Thomson-Alex", "name": { "family": "Thomson", "given": "Alex" }, "orcid": "0000-0002-9938-5048" }, { "id": "Peng-Yang", "name": { "family": "Peng", "given": "Yang" }, "orcid": "0000-0002-8868-2928" }, { "id": "Choi-Youngjoon", "name": { "family": "Choi", "given": "Youngjoon" }, "orcid": "0000-0001-9783-5992" }, { "id": "Kim-Hyunjin", "name": { "family": "Kim", "given": "Hyunjin" }, "orcid": "0000-0001-9886-0487" }, { "id": "Watanabe-Kenji", "name": { "family": "Watanabe", "given": "Kenji" }, "orcid": "0000-0003-3701-8119" }, { "id": "Taniguchi-Takashi", "name": { "family": "Taniguchi", "given": "Takashi" }, "orcid": "0000-0002-1467-3105" }, { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "von-Oppen-Felix", "name": { "family": "von Oppen", "given": "Felix" }, "orcid": "0000-0002-2537-7256" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Nadj-Perge-S", "name": { "family": "Nadj-Perge", "given": "Stevan" }, "orcid": "0000-0002-2394-9070" } ] }, "title": "Promotion of superconductivity in magic-angle graphene multilayers", "ispublished": "pub", "full_text_status": "public", "keywords": "Multidisciplinary", "note": "This work has been primarily supported by NSF-CAREER award (DMR-1753306), Office of Naval Research (grant N142112635), and Army Research Office under Grant Award W911NF17-1-0323. Nanofabrication efforts have been in part supported by Department of Energy DOE-QIS program (DE-SC0019166). S.N-P. acknowledges support from the Sloan Foundation (grant FG-2020-13716). G.R., J.A., and S.N.-P. also acknowledge support of the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation through Grant GBMF1250. C.L. acknowledges support from the Gordon and Betty Moore Foundation's EPiQS Initiative, grant GBMF8682. Y.P. acknowledges support from the startup fund from California State University, Northridge. F.v.O. is supported by Deutsche Forschungsgemeinschaft within CRC 183 (project C02) as well as the project TWISTGRAPH.", "abstract": "Graphene moir\u00e9 superlattices show an abundance of correlated insulating, topological, and superconducting phases. Whereas the origins of strong correlations and nontrivial topology can be directly linked to flat bands, the nature of superconductivity remains enigmatic. We demonstrate that magic-angle devices made of twisted tri-, quadri-, and pentalayer graphene placed on monolayer tungsten diselenide exhibit flavor polarization and superconductivity. We also observe insulating states in the tril- and quadrilayer arising at finite electric displacement fields. As the number of layers increases, superconductivity emerges over an enhanced filling-factor range, and in the pentalayer it extends well beyond the filling of four electrons per moir\u00e9 unit cell. Our results highlight the role of the interplay between flat and more dispersive bands in extending superconducting regions in graphene moir\u00e9 superlattices.", "date": "2022-09-30", "date_type": "published", "publication": "Science", "volume": "377", "number": "6614", "publisher": "American Association for the Advancement of Science", "pagerange": "1538-1543", "id_number": "CaltechAUTHORS:20221215-427737300.1", "issn": "0036-8075", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20221215-427737300.1", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-1753306" }, { "agency": "Office of Naval Research (ONR)", "grant_number": "N142112635" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF17-1-0323" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-SC0019166" }, { "agency": "Alfred P. Sloan Foundation", "grant_number": "FG-2020-13716" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF1250" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF8682" }, { "agency": "California State University, Northridge" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "CRC 183" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1126/science.abn8585", "resource_type": "article", "pub_year": "2022", "author_list": "Zhang, Yiran; Polski, Robert; et el." }, { "id": "https://authors.library.caltech.edu/records/g1vbr-pvb60", "eprint_id": 117100, "eprint_status": "archive", "datestamp": "2023-08-22 16:42:15", "lastmod": "2023-10-23 20:05:00", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wampler-Matthew", "name": { "family": "Wampler", "given": "Matthew" }, "orcid": "0000-0001-6303-3561" }, { "id": "Khor-Brian-J-J", "name": { "family": "Khor", "given": "Brian J.\u2009J." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Klich-Israel", "name": { "family": "Klich", "given": "Israel" }, "orcid": "0000-0002-8979-0170" } ] }, "title": "Stirring by Staring: Measurement-Induced Chirality", "ispublished": "pub", "full_text_status": "public", "keywords": "General Physics and Astronomy", "note": "I.\u2009K. would like to thank Kun-Woo Kim for discussions. The work of I.\u2009K., B.\u2009J.\u2009J.\u2009K., and M.\u2009W. was supported in part by the NSF Grant No. DMR-1918207. G.\u2009R. acknowledges support from the Institute of Quantum Information and Matter, an NSF Physics Frontiers Center funded by the Gordon and Betty Moore Foundation, and the Simons Foundation, as well as to the NSF DMR Grant No. 1839271. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.", "abstract": "In quantum mechanics, the observer necessarily plays an active role in the dynamics of the system, making it difficult to probe a system without disturbing it. Here, we leverage this apparent difficulty as a tool for driving an initially trivial system into a chiral phase. In particular, we show that by utilizing a pattern of repeated occupation measurements we can produce chiral edge transport of fermions hopping on a Lieb lattice. The procedure is similar in spirit to the use of periodic driving to induce chiral edge transport in Floquet topological insulators, while also exhibiting novel phenomena due to the nonunitary nature of the quantum measurements. We study in detail the dependence of the procedure on measurement frequency, showing that in the Zeno limit the system can be described by a classical stochastic dynamics, yielding protected transport. As the frequency of measurements is reduced, the charge flow is reduced and vanishes when no measurements are done.", "date": "2022-07", "date_type": "published", "publication": "Physical Review X", "volume": "12", "number": "3", "publisher": "American Physical Society", "pagerange": "Art. No. 031031", "id_number": "CaltechAUTHORS:20220920-630646700", "issn": "2160-3308", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220920-630646700", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-1918207" }, { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Simons Foundation" }, { "agency": "NSF", "grant_number": "DMR-1839271" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/physrevx.12.031031", "resource_type": "article", "pub_year": "2022", "author_list": "Wampler, Matthew; Khor, Brian J.\u2009J.; et el." }, { "id": "https://authors.library.caltech.edu/records/00m6e-msq07", "eprint_id": 110563, "eprint_status": "archive", "datestamp": "2023-08-20 07:24:07", "lastmod": "2023-10-23 19:43:43", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chaudhary-Swati", "name": { "family": "Chaudhary", "given": "Swati" } }, { "id": "Lewandowski-Cyprian", "name": { "family": "Lewandowski", "given": "Cyprian" }, "orcid": "0000-0002-6944-9805" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Shift-current response as a probe of quantum geometry and electron-electron interactions in twisted bilayer graphene", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2022 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\nReceived 2 August 2021; revised 10 January 2022; accepted 27 January 2022; published 28 February 2022. \n\nWe thank Stevan Nadj-Perge for an earlier collaboration and useful discussions. We acknowledge support from the Institute of Quantum Information and Matter, an NSF Physics Frontiers Center funded by the Gordon and Betty Moore Foundation, the Packard Foundation, and the Simons Foundation. G.R. and S.C. are grateful for support from the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award No. desc0019166. G.R. is also grateful to NSF DMR Grant No. 1839271. C.L. acknowledges support from the Gordon and Betty Moore Foundation through Grant No. GBMF8682.\n\nPublished - PhysRevResearch.4.013164.pdf
Submitted - 2107.09090.pdf
Supplemental Material - SM.pdf
Supplemental Material - charge_density_profile.mp4
", "abstract": "Moir\u00e9 materials, and in particular twisted bilayer graphene (TBG), exhibit a range of fascinating phenomena that emerge from the interplay of band topology and interactions. We show that the nonlinear second-order photoresponse is an appealing probe of this rich interplay. A dominant part of the photoresponse is the shift current, which is determined by the geometry of the electronic wave functions and carrier properties and thus becomes strongly modified by electron-electron interactions. We analyze its dependence on the twist angle and doping and investigate the role of interactions. In the absence of interactions, the response of the system is dictated by two energy scales: (i) the mean energy of direct transitions between the hole and electron flat bands and (ii) the gap between flat and dispersive bands. Including electron-electron interactions both enhances the response at the noninteracting characteristic frequencies and produces new resonances. We attribute these changes to the filling-dependent band renormalization in TBG. Our results highlight the connection between nontrivial geometric properties of TBG and its optical response, as well as demonstrate how optical probes can access the role of interactions in moir\u00e9 materials.", "date": "2022-04", "date_type": "published", "publication": "Physical Review Research", "volume": "4", "number": "1", "publisher": "American Physical Society", "pagerange": "Art. No. 013164", "id_number": "CaltechAUTHORS:20210825-184647720", "issn": "2643-1564", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210825-184647720", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF8682" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Simons Foundation" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-SC0019166" }, { "agency": "NSF", "grant_number": "DMR-1839271" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevResearch.4.013164", "primary_object": { "basename": "PhysRevResearch.4.013164.pdf", "url": "https://authors.library.caltech.edu/records/00m6e-msq07/files/PhysRevResearch.4.013164.pdf" }, "related_objects": [ { "basename": "SM.pdf", "url": "https://authors.library.caltech.edu/records/00m6e-msq07/files/SM.pdf" }, { "basename": "charge_density_profile.mp4", "url": "https://authors.library.caltech.edu/records/00m6e-msq07/files/charge_density_profile.mp4" }, { "basename": "2107.09090.pdf", "url": "https://authors.library.caltech.edu/records/00m6e-msq07/files/2107.09090.pdf" } ], "resource_type": "article", "pub_year": "2022", "author_list": "Chaudhary, Swati; Lewandowski, Cyprian; et el." }, { "id": "https://authors.library.caltech.edu/records/fdnnj-y1e72", "eprint_id": 112905, "eprint_status": "archive", "datestamp": "2023-08-22 13:52:56", "lastmod": "2023-10-23 22:50:41", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "de-la-Torre-Alberto", "name": { "family": "de la Torre", "given": "Alberto" }, "orcid": "0000-0002-6751-8205" }, { "id": "Seyler-Kyle-L", "name": { "family": "Seyler", "given": "Kyle L." }, "orcid": "0000-0003-1553-4518" }, { "id": "Buchhold-Michael", "name": { "family": "Buchhold", "given": "Michael" }, "orcid": "0000-0001-5194-9388" }, { "id": "Baum-Yuval", "name": { "family": "Baum", "given": "Yuval" }, "orcid": "0000-0003-4631-8551" }, { "id": "Zhang-Gu-Feng", "name": { "family": "Zhang", "given": "Gufeng" }, "orcid": "0000-0001-8188-2559" }, { "id": "Lauriita-Nicholas-J", "name": { "family": "Laurita", "given": "Nicholas J." }, "orcid": "0000-0002-7794-7951" }, { "id": "Harter-John-W", "name": { "family": "Harter", "given": "John W." }, "orcid": "0000-0002-7146-9370" }, { "id": "Zhao-Liuyan", "name": { "family": "Zhao", "given": "Liuyan" }, "orcid": "0000-0001-9512-3537" }, { "id": "Phinney-Isabelle", "name": { "family": "Phinney", "given": "Isabelle" } }, { "id": "Chen-Xiang", "name": { "family": "Chen", "given": "Xiang" }, "orcid": "0000-0003-3997-8148" }, { "id": "Wilson-Stephen-D", "name": { "family": "Wilson", "given": "Stephen D." }, "orcid": "0000-0003-3733-930X" }, { "id": "Cao-Gang", "name": { "family": "Cao", "given": "Gang" }, "orcid": "0000-0001-9779-430X" }, { "id": "Averitt-Richard-D", "name": { "family": "Averitt", "given": "Richard D." }, "orcid": "0000-0003-0451-1935" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Hsieh-David", "name": { "family": "Hsieh", "given": "David" }, "orcid": "0000-0002-0812-955X" } ] }, "title": "Decoupling of static and dynamic criticality in a driven Mott insulator", "ispublished": "pub", "full_text_status": "public", "keywords": "Magnetic properties and materials; Ultrafast photonics", "note": "\u00a9 The Author(s) 2022. This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. \n\nReceived 23 November 2021; Accepted 19 January 2022; Published 04 February 2022. \n\nWe thank L. Balents, A. Cavalleri, S. K. Cushing, E. Demler, S. Di. Matteo, M. Endres, B. Fine, N. Gedik, D. Kennes, O. Mehio, H. Ning, M. Norman, and M. Sentef for useful discussions. This work is supported by ARO MURI Grant No. W911NF-16-1-0361. D.H. also acknowledges support for instrumentation from the David and Lucile Packard Foundation and from the Institute for Quantum Information and Matter (IQIM), an NSF Physics Frontiers Center (PHY-1733907). A.d.l.T. acknowledges support from the Swiss National Science Foundation through an Early Postdoc Mobility Fellowship (P2GEP2165044). M.B. acknowledges support from the Alexander von Humboldt foundation. N.J.L. acknowledges support from an IQIM Fellowship. G.C. acknowledges NSF support via a grant DMR-1712101. \n\nData availability: All relevant data presented in this paper are available from the corresponding author upon reasonable request.\n\nAuthor Contributions:\nX.C., S.D.W., and G.C. synthesized and characterized the Sr2IrO4 crystals. A.d.l.T., K.L.S., and I.P. performed the SHG-RA measurements. J.W.H., L.Z., and A.d.l.T. built the SHG-RA apparatus. G.Z. and R.D.A. performed the MOKE measurements. M.B., Y.B., and G.R. performed the Langevin theory calculations. A.d.l.T., N.J.L., and D.H. analyzed the data. A.d.l.T. and D.H. wrote the paper with input from all authors.\n\nThe authors declare no competing interests.\n\nCommunications Physics thanks the anonymous reviewers for their contribution to the peer review of this work.\n\nPublished - s42005-022-00813-6.pdf
Submitted - 2112.08397.pdf
Supplemental Material - 42005_2022_813_MOESM1_ESM.pdf
", "abstract": "Strongly driven antiferromagnetic Mott insulators have the potential to exhibit exotic transient phenomena that are forbidden in thermal equilibrium. However, such far-from-equilibrium regimes, where conventional time-dependent Ginzburg-Landau descriptions fail, are experimentally challenging to prepare and to probe especially in solid state systems. Here we use a combination of time-resolved second harmonic optical polarimetry and coherent magnon spectroscopy to interrogate n-type photo-doping induced ultrafast magnetic order parameter dynamics in the antiferromagnetic Mott insulator Sr\u2082IrO\u2084. We find signatures of an unusual far-from-equilibrium critical regime in which the divergences of the magnetic correlation length and relaxation time are decoupled. This violation of conventional thermal critical behavior arises from the interplay of photo-doping and non-thermal magnon population induced demagnetization effects. Our findings, embodied in a non-equilibrium phase diagram, provide a blueprint for engineering the out-of-equilibrium properties of quantum matter, with potential applications to terahertz spintronics technologies.", "date": "2022-02-04", "date_type": "published", "publication": "Communications Physics", "volume": "5", "publisher": "Nature Publishing Group", "pagerange": "Art. No. 35", "id_number": "CaltechAUTHORS:20220113-234606083", "issn": "2399-3650", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220113-234606083", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF", "grant_number": "PHY-1733907" }, { "agency": "Swiss National Science Foundation (SNSF)", "grant_number": "P2GEP2165044" }, { "agency": "Alexander von Humboldt Foundation" }, { "agency": "NSF", "grant_number": "DMR-1712101" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1038/s42005-022-00813-6", "primary_object": { "basename": "2112.08397.pdf", "url": "https://authors.library.caltech.edu/records/fdnnj-y1e72/files/2112.08397.pdf" }, "related_objects": [ { "basename": "42005_2022_813_MOESM1_ESM.pdf", "url": "https://authors.library.caltech.edu/records/fdnnj-y1e72/files/42005_2022_813_MOESM1_ESM.pdf" }, { "basename": "s42005-022-00813-6.pdf", "url": "https://authors.library.caltech.edu/records/fdnnj-y1e72/files/s42005-022-00813-6.pdf" } ], "resource_type": "article", "pub_year": "2022", "author_list": "de la Torre, Alberto; Seyler, Kyle L.; et el." }, { "id": "https://authors.library.caltech.edu/records/m0b5h-7gr74", "eprint_id": 107004, "eprint_status": "archive", "datestamp": "2023-08-20 06:52:37", "lastmod": "2023-10-23 15:16:10", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chamberland-Christopher", "name": { "family": "Chamberland", "given": "Christopher" }, "orcid": "0000-0003-3239-5783" }, { "id": "Noh-Kyungjoo", "name": { "family": "Noh", "given": "Kyungjoo" }, "orcid": "0000-0002-6318-8472" }, { "id": "Arrangoiz-Arriola-Patricio", "name": { "family": "Arrangoiz-Arriola", "given": "Patricio" } }, { "id": "Campbell-Earl-T", "name": { "family": "Campbell", "given": "Earl T." } }, { "id": "Hann-Connor-T", "name": { "family": "Hann", "given": "Connor T." }, "orcid": "0000-0003-0665-7161" }, { "id": "Iverson-Joseph-K", "name": { "family": "Iverson", "given": "Joseph K." }, "orcid": "0000-0003-4665-8839" }, { "id": "Putterman-Harald", "name": { "family": "Putterman", "given": "Harald" }, "orcid": "0000-0002-5841-181X" }, { "id": "Bohdanowicz-Thomas-C", "name": { "family": "Bohdanowicz", "given": "Thomas C." } }, { "id": "Flammia-Steven-T", "name": { "family": "Flammia", "given": "Steven T." }, "orcid": "0000-0002-3975-0226" }, { "id": "Keller-Andrew-J", "name": { "family": "Keller", "given": "Andrew J." }, "orcid": "0000-0003-3030-1149" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Preskill-J", "name": { "family": "Preskill", "given": "John" }, "orcid": "0000-0002-2421-4762" }, { "id": "Jiang-Liang", "name": { "family": "Jiang", "given": "Liang" }, "orcid": "0000-0002-0000-9342" }, { "id": "Safavi-Naeini-Amir-H", "name": { "family": "Safavi-Naeini", "given": "Amir H." }, "orcid": "0000-0001-6176-1274" }, { "id": "Painter-O", "name": { "family": "Painter", "given": "Oskar" }, "orcid": "0000-0002-1581-9209" }, { "id": "Brand\u00e3o-F-G-S-L", "name": { "family": "Brand\u00e3o", "given": "Fernando G. S. L." }, "orcid": "0000-0003-3866-9378" } ] }, "title": "Building a fault-tolerant quantum computer using concatenated cat codes", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2022 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\n(Received 21 December 2020; revised 3 November 2021; accepted 26 January 2022; published 23 February 2022) \n\nWe thank Qian Xu for helping with the displaced Fock-basis calculation and Alex Retzker for discussions. C.C. thanks Yunong Shi and Pierre-Yves Aquilanti for their help in setting up the AWS clusters where most of the error-correction simulations were performed. We thank all the members of the AWS Center of Quantum Computing for our collaboration on building more powerful quantum technologies. We thank Richard Moulds, Nadia Carlsten, Eric Kessler, and all the members of the Amazon Braket and Quantum Solutions Lab teams. We thank Simone Severini for creating an environment where this research was possible in the first place. We thank Bill Vass, James Hamilton, and Charlie Bell for their support and guidance throughout this project.\n\nPublished - PRXQuantum.3.010329.pdf
Accepted Version - 2012.04108.pdf
", "abstract": "We present a comprehensive architectural analysis for a proposed fault-tolerant quantum computer based on cat codes concatenated with outer quantum error-correcting codes. For the physical hardware, we propose a system of acoustic resonators coupled to superconducting circuits with a two-dimensional layout. Using estimated physical parameters for the hardware, we perform a detailed error analysis of measurements and gates, including cnot and Toffoli gates. Having built a realistic noise model, we numerically simulate quantum error correction when the outer code is either a repetition code or a thin rectangular surface code. Our next step toward universal fault-tolerant quantum computation is a protocol for fault-tolerant Toffoli magic state preparation that significantly improves upon the fidelity of physical Toffoli gates at very low qubit cost. To achieve even lower overheads, we devise a new magic state distillation protocol for Toffoli states. Combining these results together, we obtain realistic full-resource estimates of the physical error rates and overheads needed to run useful fault-tolerant quantum algorithms. We find that with around 1000 superconducting circuit components, one could construct a fault-tolerant quantum computer that can run circuits, which are currently intractable for classical computers. Hardware with 18\u2009000 superconducting circuit components, in turn, could simulate the Hubbard model in a regime beyond the reach of classical computing.", "date": "2022-02", "date_type": "published", "publication": "PRX Quantum", "volume": "3", "number": "1", "publisher": "American Physical Society", "pagerange": "Art. No. 010329", "id_number": "CaltechAUTHORS:20201209-172305164", "issn": "2691-3399", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20201209-172305164", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "local_group": { "items": [ { "id": "IQIM" }, { "id": "AWS-Center-for-Quantum-Computing" } ] }, "doi": "10.1103/PRXQuantum.3.010329", "primary_object": { "basename": "2012.04108.pdf", "url": "https://authors.library.caltech.edu/records/m0b5h-7gr74/files/2012.04108.pdf" }, "related_objects": [ { "basename": "PRXQuantum.3.010329.pdf", "url": "https://authors.library.caltech.edu/records/m0b5h-7gr74/files/PRXQuantum.3.010329.pdf" } ], "resource_type": "article", "pub_year": "2022", "author_list": "Chamberland, Christopher; Noh, Kyungjoo; et el." }, { "id": "https://authors.library.caltech.edu/records/bpwcs-7v806", "eprint_id": 112185, "eprint_status": "archive", "datestamp": "2023-08-20 06:09:57", "lastmod": "2023-10-23 15:23:21", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Qi-Zihao", "name": { "family": "Qi", "given": "Zihao" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Peng-Yang", "name": { "family": "Peng", "given": "Yang" }, "orcid": "0000-0002-8868-2928" } ] }, "title": "Universal nonadiabatic energy pumping in a quasiperiodically driven extended system", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2021 American Physical Society. \n\n(Received 20 October 2021; revised 19 November 2021; accepted 19 November 2021; published 2 December 2021) \n\nWe acknowledge support from the Institute of Quantum Information and Matter, an NSF Frontier center. G.R. is also grateful for support from the Simons Foundation and the DARPA DRINQS program. Z.Q. is grateful for support from Caltech's Student-Faculty program and the Victor Neher Fellowship. Y.P. acknowledges support from the startup fund from California State University, Northridge. Numerical calculations have been performed using QuTip [42,43]. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.\n\nPublished - PhysRevB.104.224301.pdf
Submitted - 2110.07757.pdf
", "abstract": "The paradigm of Floquet engineering of topological states of matter can be generalized into the time-quasiperiodic scenario, where a lower-dimensional time-dependent system maps onto a higher-dimensional one by combining the physical dimensions with additional synthetic dimensions generated by multiple incommensurate driving frequencies. Differently from most previous works in which gapped topological phases were considered, we propose an experimentally realizable, one-dimensional chain driven by two frequencies, which maps onto a gapless Weyl semimetal in a synthetic dimension. Based on analytical reasoning and numerical simulations, we find that the nonadiabatic quantum dynamics of this system exhibit energy pumping behaviors characterized by universal functions. We also numerically find that such behaviors are robust against a considerable amount of spatial disorder.", "date": "2021-12-01", "date_type": "published", "publication": "Physical Review B", "volume": "104", "number": "22", "publisher": "American Physical Society", "pagerange": "Art. No. 224301", "id_number": "CaltechAUTHORS:20211202-233649522", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20211202-233649522", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Simons Foundation" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Caltech Summer Undergraduate Research Fellowship (SURF)" }, { "agency": "California State University, Northridge" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/physrevb.104.224301", "primary_object": { "basename": "2110.07757.pdf", "url": "https://authors.library.caltech.edu/records/bpwcs-7v806/files/2110.07757.pdf" }, "related_objects": [ { "basename": "PhysRevB.104.224301.pdf", "url": "https://authors.library.caltech.edu/records/bpwcs-7v806/files/PhysRevB.104.224301.pdf" } ], "resource_type": "article", "pub_year": "2021", "author_list": "Qi, Zihao; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/1bm08-52f02", "eprint_id": 109075, "eprint_status": "archive", "datestamp": "2023-08-20 06:05:56", "lastmod": "2023-10-23 17:33:14", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Psaroudaki-Christina", "name": { "family": "Psaroudaki", "given": "Christina" }, "orcid": "0000-0002-7073-6422" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Photon pumping in a weakly-driven quantum cavity\u2013spin system", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2021 Elsevier Inc. \n\nReceived 13 April 2021, Accepted 4 June 2021, Available online 11 June 2021. \n\nWe are grateful to Ivar Martin and Frederik Nathan for useful discussions. C.P. has received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 839004. We are also grateful to the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award de-sc0019166. G.R. is also grateful to the NSF DMR, USA Grant No. 1839271. NSF and DOE supported G.R.'s time commitment to the project in equal shares. NSF provided partial support to C.P. This work was performed in part at Aspen Center for Physics, which is supported by National Science Foundation, USA grant PHY-1607611. G.R. is also grateful for support from the Simons Foundation, USA and the Packard Foundation, USA. \n\nCRediT authorship contribution statement: Christina Psaroudaki: Formal analysis, Investigation, Writing - original draft, Visualization, Methodology, Software, Funding acquisition. Gil Refael: Conceptualization, Methodology, Validation, Supervision, Funding acquisition, Formal analysis. \n\nThe authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.\n\nSubmitted - 2104.06419.pdf
", "abstract": "We investigate the photon pumping effect in a topological model consisting of a periodically driven spin-1/2 coupled to a quantum cavity mode out of the adiabatic limit. In the strong-drive adiabatic limit, a quantized frequency conversion of photons is expected as the temporal analog of the Hall current. We numerically establish a novel photon pumping phenomenon in the experimentally accessible nonadiabatic driving regime for a broad region of the parameter space. The photon frequency conversion efficiency exhibits strong fluctuations and high efficiency that can reach up 80% of the quantized value for commensurate frequency combinations. We link the pumping properties to the delocalization of the corresponding Floquet states which display multifractal behavior as the result of hybridization between localized and delocalized sectors. Finally we demonstrate that the quantum coherence properties of the initial state are preserved during the frequency conversion process in both the strong and ultra-weak-drive limit.", "date": "2021-12", "date_type": "published", "publication": "Annals of Physics", "volume": "435", "publisher": "Elsevier", "pagerange": "Art. No. 168553", "id_number": "CaltechAUTHORS:20210511-095252246", "issn": "0003-4916", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210511-095252246", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Marie Curie Fellowship", "grant_number": "839004" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-SC0019166" }, { "agency": "NSF", "grant_number": "DMR-1839271" }, { "agency": "NSF", "grant_number": "PHY-1607611" }, { "agency": "Simons Foundation" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1016/j.aop.2021.168553", "primary_object": { "basename": "2104.06419.pdf", "url": "https://authors.library.caltech.edu/records/1bm08-52f02/files/2104.06419.pdf" }, "resource_type": "article", "pub_year": "2021", "author_list": "Psaroudaki, Christina and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/fgs93-e3677", "eprint_id": 95010, "eprint_status": "archive", "datestamp": "2023-08-20 03:21:11", "lastmod": "2023-10-20 18:29:16", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zirnstein-Heinrich-Gregor", "name": { "family": "Zirnstein", "given": "Heinrich-Gregor" }, "orcid": "0000-0001-7055-9959" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Rosenow-Bernd", "name": { "family": "Rosenow", "given": "Bernd" } } ] }, "title": "Bulk-Boundary Correspondence for Non-Hermitian Hamiltonians via Green Functions", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2021 American Physical Society. \n\nReceived 16 July 2020; accepted 4 May 2021; published 28 May 2021. \n\nWe would like to thank T. Karzig for helpful discussions. B.\u2009R. and H.-G.\u2009Z. acknowledge financial support from the German Research Foundation within the CRC 762 (project B6). B.\u2009R. acknowledges support from the Rosi and Max Varon Visiting Professorship at the Weizmann Institute of Science. We are grateful for the hospitality of the Aspen Center for Physics, funded by NSF Grant No. PHY-1607611, where part of this work was performed. G.\u2009R. is grateful for generous support from the Institute of Quantum Information and Matter, an NSF frontier center, NSF Grant No. 1839271, and The Simons Foundation.\n\nPublished - PhysRevLett.126.216407.pdf
Submitted - 1901.11241.pdf
Supplemental Material - supplement.pdf
", "abstract": "Genuinely non-Hermitian topological phases can be realized in open systems with sufficiently strong gain and loss; in such phases, the Hamiltonian cannot be deformed into a gapped Hermitian Hamiltonian without energy bands touching each other. Comparing Green functions for periodic and open boundary conditions we find that, in general, there is no correspondence between topological invariants computed for periodic boundary conditions, and boundary eigenstates observed for open boundary conditions. Instead, we find that the non-Hermitian winding number in one dimension signals a topological phase transition in the bulk: It implies spatial growth of the bulk Green function.", "date": "2021-05-28", "date_type": "published", "publication": "Physical Review Letters", "volume": "126", "number": "21", "publisher": "American Physical Society", "pagerange": "Art. No. 216407", "id_number": "CaltechAUTHORS:20190426-083909000", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190426-083909000", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "CRC 762" }, { "agency": "Weizmann Institute of Science" }, { "agency": "NSF", "grant_number": "PHY-1607611" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF", "grant_number": "DMR-1839271" }, { "agency": "Simons Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.126.216407", "primary_object": { "basename": "PhysRevLett.126.216407.pdf", "url": "https://authors.library.caltech.edu/records/fgs93-e3677/files/PhysRevLett.126.216407.pdf" }, "related_objects": [ { "basename": "supplement.pdf", "url": "https://authors.library.caltech.edu/records/fgs93-e3677/files/supplement.pdf" }, { "basename": "1901.11241.pdf", "url": "https://authors.library.caltech.edu/records/fgs93-e3677/files/1901.11241.pdf" } ], "resource_type": "article", "pub_year": "2021", "author_list": "Zirnstein, Heinrich-Gregor; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/ms24v-5cc11", "eprint_id": 107325, "eprint_status": "archive", "datestamp": "2023-08-20 02:56:37", "lastmod": "2023-10-23 15:45:39", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Peng-Changnan", "name": { "family": "Peng", "given": "Changnan" }, "orcid": "0000-0002-9331-2614" }, { "id": "Haim-Arbel", "name": { "family": "Haim", "given": "Arbel" } }, { "id": "Karzig-Torsten", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Peng-Yang", "name": { "family": "Peng", "given": "Yang" }, "orcid": "0000-0002-8868-2928" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Floquet Majorana bound states in voltage-biased planar Josephson junctions", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2021 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\nReceived 11 January 2021; revised 11 April 2021; accepted 13 April 2021; published 10 May 2021. \n\nThis research was supported by the Institute of Quantum Information and Matter, an NSF Frontier Center funded by the Gordon and Betty Moore Foundation, the Packard Foundation, and the Simons Foundation. A.H. acknowledges support from the Walter Burke Institute for Theoretical Physics at the California Institute of Technology. The results of this work were obtained prior to the employment of A.H. at the Amazon Web Services Center for Quantum Computing. G.R. is also grateful for support through NSF DMR Grant No. 1839271. This work was performed in part at the Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.\n\nPublished - PhysRevResearch.3.023108.pdf
Submitted - 2011.06000.pdf
", "abstract": "We study a planar Josephson junction under an applied DC voltage bias in the presence of an in-plane magnetic field. Upon tuning the bias voltage across the junction V_J, the two ends of the junction are shown to simultaneously host both zero and \u03c0 Majorana modes. These modes can be probed using either a scanning-tunneling-microscopy measurement or through resonant Andreev tunneling from a lead coupled to the junction. While these modes are mostly bound to the junction's ends, they can hybridize with the bulk by absorbing or emitting photons. We analyze this process both numerically and analytically, demonstrating that it can become negligible under typical experimental conditions. Transport signatures of the zero and \u03c0 Majorana states are shown to be robust to moderate disorder.", "date": "2021-05", "date_type": "published", "publication": "Physical Review Research", "volume": "3", "number": "2", "publisher": "American Physical Society", "pagerange": "Art. No. 023108", "id_number": "CaltechAUTHORS:20210105-133420695", "issn": "2643-1564", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210105-133420695", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Simons Foundation" }, { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" }, { "agency": "NSF", "grant_number": "DMR-1839271" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevResearch.3.023108", "primary_object": { "basename": "2011.06000.pdf", "url": "https://authors.library.caltech.edu/records/ms24v-5cc11/files/2011.06000.pdf" }, "related_objects": [ { "basename": "PhysRevResearch.3.023108.pdf", "url": "https://authors.library.caltech.edu/records/ms24v-5cc11/files/PhysRevResearch.3.023108.pdf" } ], "resource_type": "article", "pub_year": "2021", "author_list": "Peng, Changnan; Haim, Arbel; et el." }, { "id": "https://authors.library.caltech.edu/records/91pcf-7nx16", "eprint_id": 106629, "eprint_status": "archive", "datestamp": "2023-08-20 02:45:05", "lastmod": "2023-10-20 23:38:30", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chaudhary-Swati", "name": { "family": "Chaudhary", "given": "Swati" } }, { "id": "Knapp-Christina", "name": { "family": "Knapp", "given": "Christina" }, "orcid": "0000-0002-5982-8107" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Anomalous exciton transport in response to a uniform in-plane electric field", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2021 American Physical Society. \n\nReceived 2 October 2020; revised 9 March 2021; accepted 7 April 2021; published 16 April 2021. \n\nWe are grateful to Felix von Oppen and Michael Fogler for stimulating conversations. This work was supported by the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, the Packard Foundation, and the Simons Foundation. S.C. and G.R. thank the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. de-sc0019166. G.R. is also grateful for the NSF DMR Grant No. 1839271. NSF and DOE supported G.R.'s time commitment to the project in equal shares. C.K. acknowledges support from the Walter Burke Institute for Theoretical Physics at Caltech.\n\nPublished - PhysRevB.103.165119.pdf
Submitted - 2009.07865.pdf
", "abstract": "Excitons are neutral objects that, naively, should have no response to a uniform electric field. Could the Berry curvature of the underlying electronic bands alter this conclusion? In this work, we show that Berry curvature can indeed lead to anomalous transport for excitons in two-dimensional materials subject to a uniform in-plane electric field. By considering the constituent electron and hole dynamics, we demonstrate that there exists a regime for which the corresponding anomalous velocities are in the same direction. We establish the resulting center-of-mass motion of the exciton through both a semiclassical and fully quantum mechanical analysis, and elucidate the critical role of Bloch oscillations in achieving this effect. We identify transition metal dichalcogenide heterobilayers as candidate materials to observe the effect.", "date": "2021-04-15", "date_type": "published", "publication": "Physical Review B", "volume": "103", "number": "16", "publisher": "American Physical Society", "pagerange": "Art. No. 165119", "id_number": "CaltechAUTHORS:20201111-135554466", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20201111-135554466", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Simons Foundation" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-SC0019166" }, { "agency": "NSF", "grant_number": "DMR-1839271" }, { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevB.103.165119", "primary_object": { "basename": "2009.07865.pdf", "url": "https://authors.library.caltech.edu/records/91pcf-7nx16/files/2009.07865.pdf" }, "related_objects": [ { "basename": "PhysRevB.103.165119.pdf", "url": "https://authors.library.caltech.edu/records/91pcf-7nx16/files/PhysRevB.103.165119.pdf" } ], "resource_type": "article", "pub_year": "2021", "author_list": "Chaudhary, Swati; Knapp, Christina; et el." }, { "id": "https://authors.library.caltech.edu/records/rsqyx-b6k74", "eprint_id": 103292, "eprint_status": "archive", "datestamp": "2023-08-20 01:45:46", "lastmod": "2023-10-20 15:53:01", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Heu\u00dfen-Sascha", "name": { "family": "Heu\u00dfen", "given": "Sascha" }, "orcid": "0000-0002-7581-2148" }, { "id": "White-Christopher-David", "name": { "family": "White", "given": "Christopher David" }, "orcid": "0000-0002-8372-2492" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Extracting many-body localization lengths with an imaginary vector potential", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2021 American Physical Society. \n\nReceived 3 June 2020; revised 1 December 2020; accepted 2 December 2020; published 3 February 2021. \n\nWe thank Bernd Rosenow, Sarang Gopalakrishnan, and Vadim Oganesyan for many helpful conversations; we also thank Naomichi Hatano and an anonymous reviewer for commentary that prompted us to sharpen our understanding and arguments. G.R. is grateful for funding from NSF Grant No. 1839271 as well as to the Simons Foundation, the Packard Foundation, and the IQIM, an NSF frontier center partially funded by the Gordon and Betty Moore Foundation. The authors thank FAU Erlangen-N\u00fcrnberg's Prof. Dr. Kai P. Schmidt for setting up and accompanying the team of researchers involved in this work. We gratefully acknowledge funding received by the German Academic Exchange Service. This work is partially supported by the US Department of Energy (DOE), Office of Science, Office of Advanced Scientific Computing Research (ASCR) Quantum Computing Application Teams program, under Fieldwork Proposal No. ERKJ347.\n\nPublished - PhysRevB.103.064201.pdf
Submitted - 2003.09430.pdf
", "abstract": "One challenge of studying the many-body localization transition is defining the length scale that diverges upon the transition to the ergodic phase. In this manuscript we explore the localization properties of a ring with onsite disorder subject to an imaginary magnetic flux. We connect the imaginary flux which delocalizes single-particle orbitals of an Anderson-localized ring with the localization length of an open chain. We thus identify the delocalizing imaginary flux per site with an inverse localization length characterizing the transport properties of the open chain. We put this intuition to use by exploring the phase diagram of a disordered interacting chain, and we find that the inverse imaginary flux per bond provides an accessible description of the transition and its diverging localization length.", "date": "2021-02-01", "date_type": "published", "publication": "Physical Review B", "volume": "103", "number": "6", "publisher": "American Physical Society", "pagerange": "Art. No. 064201", "id_number": "CaltechAUTHORS:20200518-153736634", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200518-153736634", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-1839271" }, { "agency": "Simons Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Deutscher Akademischer Austauschdienst (DAAD)" }, { "agency": "Department of Energy (DOE)", "grant_number": "ERKJ347" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.103.064201", "primary_object": { "basename": "2003.09430.pdf", "url": "https://authors.library.caltech.edu/records/rsqyx-b6k74/files/2003.09430.pdf" }, "related_objects": [ { "basename": "PhysRevB.103.064201.pdf", "url": "https://authors.library.caltech.edu/records/rsqyx-b6k74/files/PhysRevB.103.064201.pdf" } ], "resource_type": "article", "pub_year": "2021", "author_list": "Heu\u00dfen, Sascha; White, Christopher David; et el." }, { "id": "https://authors.library.caltech.edu/records/5tzpp-vvv59", "eprint_id": 107284, "eprint_status": "archive", "datestamp": "2023-08-20 01:09:25", "lastmod": "2023-10-23 15:42:30", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ning-Honglie", "name": { "family": "Ning", "given": "H." } }, { "id": "Mehio-Omar", "name": { "family": "Mehio", "given": "O." } }, { "id": "Buchhold-Michael", "name": { "family": "Buchhold", "given": "M." }, "orcid": "0000-0001-5194-9388" }, { "id": "Kurumaji-Takashi", "name": { "family": "Kurumaji", "given": "T." }, "orcid": "0000-0002-2157-3727" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Checkelsky-Joseph-G", "name": { "family": "Checkelsky", "given": "J.\u2009G." }, "orcid": "0000-0003-0325-5204" }, { "id": "Hsieh-David", "name": { "family": "Hsieh", "given": "D." }, "orcid": "0000-0002-0812-955X" } ] }, "title": "Signatures of Ultrafast Reversal of Excitonic Order in Ta\u2082NiSe\u2085", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2020 American Physical Society. \n\n(Received 15 June 2020; revised 25 August 2020; accepted 24 November 2020; published 22 December 2020) \n\nWe thank Rick Averitt, Edoardo Baldini, Swati Chaudhary, Nuh Gedik, Xinwei Li, Tianwei Tang, and Alfred Zong for useful discussions. D.\u2009H. and J.\u2009G.\u2009C. acknowledge support from the DARPA DRINQS program (Grant No. D18AC00014). D.\u2009H. also acknowledges support for instrumentation from the Institute for Quantum Information and Matter, a NSF Physics Frontiers Center (PHY-1733907). M.\u2009B. acknowledges the support from the Department of Energy under Award No. DE-SC0019166. T.\u2009K. acknowledges the support by the Yamada Science Foundation Fellowship for Research Abroad and JSPS Overseas Research Fellowships.\n\nPublished - PhysRevLett.125.267602.pdf
Accepted Version - 2012.12912.pdf
Supplemental Material - ARR_Ning_8-24-2020_SI.pdf
", "abstract": "In the presence of electron-phonon coupling, an excitonic insulator harbors two degenerate ground states described by an Ising-type order parameter. Starting from a microscopic Hamiltonian, we derive the equations of motion for the Ising order parameter in the phonon coupled excitonic insulator Ta\u2082NiSe\u2085 and show that it can be controllably reversed on ultrashort timescales using appropriate laser pulse sequences. Using a combination of theory and time-resolved optical reflectivity measurements, we report evidence of such order parameter reversal in Ta\u2082NiSe\u2085 based on the anomalous behavior of its coherently excited order-parameter-coupled phonons. Our Letter expands the field of ultrafast order parameter control beyond spin and charge ordered materials.", "date": "2020-12-31", "date_type": "published", "publication": "Physical Review Letters", "volume": "125", "number": "26", "publisher": "American Physical Society", "pagerange": "Art. No. 267602", "id_number": "CaltechAUTHORS:20201224-090002408", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20201224-090002408", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency", "grant_number": "D18AC00014" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF", "grant_number": "PHY-1733907" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-SC0019166" }, { "agency": "Yamada Science Foundation" }, { "agency": "Japan Society for the Promotion of Science (JSPS)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/physrevlett.125.267602", "primary_object": { "basename": "PhysRevLett.125.267602.pdf", "url": "https://authors.library.caltech.edu/records/5tzpp-vvv59/files/PhysRevLett.125.267602.pdf" }, "related_objects": [ { "basename": "2012.12912.pdf", "url": "https://authors.library.caltech.edu/records/5tzpp-vvv59/files/2012.12912.pdf" }, { "basename": "ARR_Ning_8-24-2020_SI.pdf", "url": "https://authors.library.caltech.edu/records/5tzpp-vvv59/files/ARR_Ning_8-24-2020_SI.pdf" } ], "resource_type": "article", "pub_year": "2020", "author_list": "Ning, H.; Mehio, O.; et el." }, { "id": "https://authors.library.caltech.edu/records/65542-z5p22", "eprint_id": 100335, "eprint_status": "archive", "datestamp": "2023-08-20 00:30:22", "lastmod": "2023-10-18 19:52:00", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chaudhary-Swati", "name": { "family": "Chaudhary", "given": "Swati" } }, { "id": "Haim-Arbel", "name": { "family": "Haim", "given": "Arbel" } }, { "id": "Peng-Yang", "name": { "family": "Peng", "given": "Yang" }, "orcid": "0000-0002-8868-2928" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Phonon-induced Floquet topological phases protected by space-time symmetries", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2020 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\nReceived 15 January 2020; revised 6 October 2020; accepted 11 December 2020; published 29 December 2020. \n\nWe acknowledge support from the Institute of Quantum Information and Matter, an NSF Physics Frontiers Center funded by the Gordon and Betty Moore Foundation, the Packard Foundation, and the Simons Foundation. A.H. and Y.P. are grateful for support from the Walter Burke Institute for Theoretical Physics at Caltech. Y.P. acknowledges support from the startup fund from California State University, Northridge. G.R. is grateful for support from ARO MURI Award No. W911NF-16-1-0361, \"Quantum Materials by Design with Electromagnetic Excitation,\" sponsored by the US Army.\n\nPublished - PhysRevResearch.2.043431.pdf
Submitted - 1911.07892.pdf
", "abstract": "For systems with spatial and nonspatial symmetries, the topological classification depends not only on these symmetries but also on the commutation/anticommutation relations between spatial and nonspatial symmetries. The coexistence of spatial and nonspatial symmetries together with appropriate commutation/anticommutation relations between them can give rise to crystalline and higher-order topological phases, which host gapless boundary modes. Alternatively, space-time symmetries in a Floquet system can take the role of spatial symmetries in deciding the topological classification. Promoting a spatial symmetry to a space-time symmetry can alter the commutation relations, which in turn can modify the topological properties of the system. We show how a coherently excited phonon mode can be used to promote a spatial symmetry with which the static system is always trivial to a space-time symmetry which supports a nontrivial Floquet topological phase. We demonstrate this effect by considering two systems: The first is a second-order topological superconductor, and the second is a first-order crystalline topological insulator. In both these cases, a coherently excited phonon mode is responsible for promoting the reflection symmetry to a time-glide symmetry. This newly introduced symmetry allows the previously trivial system to host gapless modes. In the first case, these are protected corner modes, while in the second case, these are gapless edge modes.", "date": "2020-12", "date_type": "published", "publication": "Physical Review Research", "volume": "2", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 043431", "id_number": "CaltechAUTHORS:20191217-115034328", "issn": "2643-1564", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191217-115034328", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Simons Foundation" }, { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" }, { "agency": "California State University, Northridge" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevResearch.2.043431", "primary_object": { "basename": "1911.07892.pdf", "url": "https://authors.library.caltech.edu/records/65542-z5p22/files/1911.07892.pdf" }, "related_objects": [ { "basename": "PhysRevResearch.2.043431.pdf", "url": "https://authors.library.caltech.edu/records/65542-z5p22/files/PhysRevResearch.2.043431.pdf" } ], "resource_type": "article", "pub_year": "2020", "author_list": "Chaudhary, Swati; Haim, Arbel; et el." }, { "id": "https://authors.library.caltech.edu/records/n3vhy-dt084", "eprint_id": 103299, "eprint_status": "archive", "datestamp": "2023-08-20 00:31:03", "lastmod": "2023-10-20 15:54:10", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Nathan-Frederik", "name": { "family": "Nathan", "given": "Frederik" }, "orcid": "0000-0001-9700-0231" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Rudner-Mark-S", "name": { "family": "Rudner", "given": "Mark S." }, "orcid": "0000-0002-5150-6234" }, { "id": "Martin-Ivar", "name": { "family": "Martin", "given": "Ivar" }, "orcid": "0000-0002-2010-6449" } ] }, "title": "Quantum frequency locking and downconversion in a driven qubit-cavity system", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2020 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\nReceived 8 April 2020; revised 19 November 2020; accepted 7 December 2020; published 23 December 2020. \n\nI.M. was supported by the Materials Sciences and Engineering Division, Basic Energy Sciences, Office of Science, U. S. Dept. of Energy. F.N. and M.S.R. are grateful to the Villum Foundation and the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 678862) for support. G.R. is grateful for NSF DMR Grant No. 1839271. G.R. is also grateful to the U. S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0019166. NSF and DOE supported G.R.'s time commitment to the project in equal shares.\n\nPublished - PhysRevResearch.2.043411.pdf
Submitted - 2003.05648.pdf
", "abstract": "We study a periodically driven qubit coupled to a quantized cavity mode. Despite its apparent simplicity, this system supports a rich variety of exotic phenomena, such as topological frequency conversion as recently discovered in Martin et al. [Phys. Rev. X 7, 041008 (2017)]. Here we report on a qualitatively different phenomenon that occurs in this platform, where the cavity mode's oscillations lock their frequency to a rational fraction r/q of the driving frequency \u03a9. This phenomenon, which we term quantum frequency locking, is characterized by the emergence of q-tuplets of stationary (Floquet) states whose quasienergies are separated by \u03a9/q, up to exponentially small corrections. The Wigner functions of these states are nearly identical, and exhibit highly regular and symmetric structure in phase space. Similarly to Floquet time crystals, these states underlie discrete time-translation symmetry breaking in the model. We develop a semiclassical approach for analyzing and predicting quantum frequency locking in the model, and use it to identify the conditions under which it occurs.", "date": "2020-12", "date_type": "published", "publication": "Physical Review Research", "volume": "2", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 043411", "id_number": "CaltechAUTHORS:20200519-080742316", "issn": "2643-1564", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200519-080742316", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)", "grant_number": "DE-SC0019166" }, { "agency": "Villum Foundation" }, { "agency": "European Research Council (ERC)", "grant_number": "678862" }, { "agency": "NSF", "grant_number": "DMR-1839271" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevResearch.2.043411", "primary_object": { "basename": "2003.05648.pdf", "url": "https://authors.library.caltech.edu/records/n3vhy-dt084/files/2003.05648.pdf" }, "related_objects": [ { "basename": "PhysRevResearch.2.043411.pdf", "url": "https://authors.library.caltech.edu/records/n3vhy-dt084/files/PhysRevResearch.2.043411.pdf" } ], "resource_type": "article", "pub_year": "2020", "author_list": "Nathan, Frederik; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/zqxn5-ecv65", "eprint_id": 100322, "eprint_status": "archive", "datestamp": "2023-08-20 00:17:46", "lastmod": "2023-10-18 19:51:06", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Ron-Alon", "name": { "family": "Ron", "given": "A." }, "orcid": "0000-0002-1840-7824" }, { "id": "Chaudhary-Swati", "name": { "family": "Chaudhary", "given": "S." } }, { "id": "Zhang-Gufeng", "name": { "family": "Zhang", "given": "G." } }, { "id": "Ning-Honglie", "name": { "family": "Ning", "given": "H." } }, { "id": "Zoghlin-E", "name": { "family": "Zoghlin", "given": "E." }, "orcid": "0000-0002-8160-584X" }, { "id": "Wilson-S-D", "name": { "family": "Wilson", "given": "S. D." } }, { "id": "Averitt-R-D", "name": { "family": "Averitt", "given": "R. D." }, "orcid": "0000-0003-0451-1935" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Hsieh-David", "name": { "family": "Hsieh", "given": "D." }, "orcid": "0000-0002-0812-955X" } ] }, "title": "Ultrafast Enhancement of Ferromagnetic Spin Exchange Induced by Ligand-to-Metal Charge Transfer", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2020 American Physical Society. \n\nReceived 10 December 2019; revised 17 August 2020; accepted 2 October 2020; published 4 November 2020. \n\nThis work was supported by ARO MURI Grant No. W911NF-16-1-0361. D.\u2009H. and G.\u2009R. also acknowledge support from the David and Lucile Packard Foundation. D.\u2009H. acknowledges support for instrumentation from the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center (PHY-1733907). A.\u2009R. acknowledges support from the Caltech Prize Fellowship, the Zuckerman Foundation, and the Israel Science Foundation (Grant No. 1017/20). The MRL Shared Experimental Facilities are supported by the MRSEC Program of the NSF under Grant No. DMR 1720256, a member of the NSF-funded Materials Research Facilities Network. S.\u2009D.\u2009W. acknowledges support from the Nanostructures Cleanroom Facility at the California NanoSystems Institute (CNSI). G.\u2009R. also acknowledges partial support through DOE Award No. DE-SC0019166.\n\nPublished - PhysRevLett.125.197203.pdf
Submitted - 1910.06376.pdf
Supplemental Material - ARR2_Ron_10-1-2020_SI.pdf
", "abstract": "We theoretically predict and experimentally demonstrate a nonthermal pathway to optically enhance superexchange interaction energies in a material based on exciting ligand-to-metal charge-transfer transitions, which introduces lower-order virtual hopping contributions that are absent in the ground state. We demonstrate this effect in the layered ferromagnetic insulator CrSiTe\u2083 by exciting Te-to-Cr charge-transfer transitions using ultrashort laser pulses and detecting coherent phonon oscillations that are impulsively generated by superexchange enhancement via magneto-elastic coupling. This mechanism kicks in below the temperature scale where short-range in-plane spin correlations begin to develop and disappears when the excitation energy is tuned away from the charge-transfer resonance, consistent with our predictions.", "date": "2020-11-06", "date_type": "published", "publication": "Physical Review Letters", "volume": "125", "number": "19", "publisher": "American Physical Society", "pagerange": "Art. No. 197203", "id_number": "CaltechAUTHORS:20191217-085020547", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191217-085020547", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF", "grant_number": "PHY-1733907" }, { "agency": "Caltech" }, { "agency": "Zuckerman Foundation" }, { "agency": "Israel Science Foundation", "grant_number": "1017/20" }, { "agency": "NSF", "grant_number": "DMR-1720256" }, { "agency": "California NanoSystems Institute" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-SC0019166" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.125.197203", "primary_object": { "basename": "1910.06376.pdf", "url": "https://authors.library.caltech.edu/records/zqxn5-ecv65/files/1910.06376.pdf" }, "related_objects": [ { "basename": "ARR2_Ron_10-1-2020_SI.pdf", "url": "https://authors.library.caltech.edu/records/zqxn5-ecv65/files/ARR2_Ron_10-1-2020_SI.pdf" }, { "basename": "PhysRevLett.125.197203.pdf", "url": "https://authors.library.caltech.edu/records/zqxn5-ecv65/files/PhysRevLett.125.197203.pdf" } ], "resource_type": "article", "pub_year": "2020", "author_list": "Ron, A.; Chaudhary, S.; et el." }, { "id": "https://authors.library.caltech.edu/records/8tp61-4g338", "eprint_id": 106127, "eprint_status": "archive", "datestamp": "2023-08-19 23:53:15", "lastmod": "2023-10-20 23:07:05", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Katz-Or", "name": { "family": "Katz", "given": "Or" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" } ] }, "title": "Optically induced flat bands in twisted bilayer graphene", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2020 American Physical Society. \n\nReceived 19 November 2019; revised 7 September 2020; accepted 14 September 2020; published 16 October 2020. \n\nWe are grateful to F. von Oppen for helpful comments and to S. Fang for helpful discussions. N.H.L. and O.K. acknowledge financial support from the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 639172). We acknowledge support from the IQIM, an NSF Physics Frontier Center funded by Gordon and Betty Moore Foundation. We are grateful for support from ARO MURI W911NF-16-1-0361 \"Quantum Materials by Design with Electromagnetic Excitation\" sponsored by the U.S. Army, as well as NSF grant 1839271. G.R. is also grateful for support from the Simons Foundation and the Packard Foundation. This work was performed, in part, at Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607611.\n\nPublished - PhysRevB.102.155123.pdf
Submitted - 1910.13510.pdf
", "abstract": "Twisted bilayer graphene at the magic twist angle features flat energy bands, which lead to superconductivity and strong correlation physics. These unique properties are typically limited to a narrow range of twist angles around the magic angle with a small allowed tolerance. Here, we report on a mechanism that enables flattening of the band structure using coherent optical illumination, leading to emergence of flat isolated Floquet-Bloch bands. We show that the effect can be realized with relatively weak optical beams at the visible-infrared range (below the material bandwidth) and persist for a wide range of small twist angles, increasing the allowed twist tolerance by an order of magnitude. We discuss the conditions under which these bands exhibit a nonzero Chern number. These optically induced flat bands could potentially host strongly correlated nonequilibrium electronic states of matter.", "date": "2020-10-15", "date_type": "published", "publication": "Physical Review B", "volume": "102", "number": "15", "publisher": "American Physical Society", "pagerange": "Art. No. 155123", "id_number": "CaltechAUTHORS:20201016-153328923", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20201016-153328923", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "European Research Council (ERC)", "grant_number": "639172" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "NSF", "grant_number": "DMR-1839271" }, { "agency": "Simons Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.102.155123", "primary_object": { "basename": "1910.13510.pdf", "url": "https://authors.library.caltech.edu/records/8tp61-4g338/files/1910.13510.pdf" }, "related_objects": [ { "basename": "PhysRevB.102.155123.pdf", "url": "https://authors.library.caltech.edu/records/8tp61-4g338/files/PhysRevB.102.155123.pdf" } ], "resource_type": "article", "pub_year": "2020", "author_list": "Katz, Or; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/zm6hs-12m98", "eprint_id": 102654, "eprint_status": "archive", "datestamp": "2023-08-19 21:43:41", "lastmod": "2023-10-20 00:22:59", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Buchhold-M", "name": { "family": "Buchhold", "given": "M." }, "orcid": "0000-0001-5194-9388" }, { "id": "Tang-C-S", "name": { "family": "Tang", "given": "C. S." } }, { "id": "Silevitch-D-M", "name": { "family": "Silevitch", "given": "D. M." }, "orcid": "0000-0002-6347-3513" }, { "id": "Rosenbaum-T-F", "name": { "family": "Rosenbaum", "given": "T. F." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } } ] }, "title": "Quantum dynamics in strongly driven random dipolar magnets", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2020 American Physical Society. \n\nReceived 24 February 2020; revised manuscript received 13 May 2020; accepted 13 May 2020; published 1 June 2020. \n\nThis work was partially supported by the Department of Energy under Grant No. DE-SC0019166. M.B. acknowledges support from the Alexander von Humboldt foundation. T.F.R. acknowledges support from US Department of Energy Basic Energy Sciences Award No. DE-SC0014866. We thank Gabriel Aeppli and Markus M\u00fcller for fruitful discussions.\n\nPublished - PhysRevB.101.214201.pdf
Submitted - 2002.07834.pdf
", "abstract": "The random dipolar magnet LiHo_xY_(1\u2212x)F\u2084 enters a strongly frustrated regime for small Ho\u00b3\u207a concentrations with x < 0.05. In this regime, the magnetic moments of the Ho\u00b3\u207a ions experience small quantum corrections to the common Ising approximation of LiHo_xY_(1\u2212x)F\u2084, which lead to a Z\u2082-symmetry breaking and small, degeneracy breaking energy shifts between different eigenstates. Here we show that destructive interference between two almost degenerate excitation pathways burns spectral holes in the magnetic susceptibility of strongly driven magnetic moments in LiHo_xY_(1\u2212x)F\u2084. Such spectral holes in the susceptibility, microscopically described in terms of Fano resonances, can already occur in setups of only two or three frustrated moments, for which the driven level scheme has the paradigmatic \u039b shape. For larger clusters of magnetic moments, the corresponding level schemes separate into almost isolated many-body \u039b schemes, in the sense that either the transition matrix elements between them are negligibly small or the energy difference of the transitions is strongly off-resonant to the drive. This enables the observation of Fano resonances, caused by many-body quantum corrections to the common Ising approximation also in the thermodynamic limit. We discuss its dependence on the driving strength and frequency as well as the crucial role that is played by lattice dissipation.", "date": "2020-06-01", "date_type": "published", "publication": "Physical Review B", "volume": "101", "number": "21", "publisher": "American Physical Society", "pagerange": "Art. No. 214201", "id_number": "CaltechAUTHORS:20200420-111501884", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200420-111501884", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)", "grant_number": "DE-SC0019166" }, { "agency": "Alexander von Humboldt Foundation" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-SC0014866" } ] }, "doi": "10.1103/PhysRevB.101.214201", "primary_object": { "basename": "2002.07834.pdf", "url": "https://authors.library.caltech.edu/records/zm6hs-12m98/files/2002.07834.pdf" }, "related_objects": [ { "basename": "PhysRevB.101.214201.pdf", "url": "https://authors.library.caltech.edu/records/zm6hs-12m98/files/PhysRevB.101.214201.pdf" } ], "resource_type": "article", "pub_year": "2020", "author_list": "Buchhold, M.; Tang, C. S.; et el." }, { "id": "https://authors.library.caltech.edu/records/jhm99-py963", "eprint_id": 94980, "eprint_status": "archive", "datestamp": "2023-08-22 03:14:36", "lastmod": "2023-10-20 18:27:50", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Werner-Philipp", "name": { "family": "Werner", "given": "Philipp" }, "orcid": "0000-0002-2136-6568" }, { "id": "Eckstein-Martin", "name": { "family": "Eckstein", "given": "Martin" }, "orcid": "0000-0003-0124-5408" }, { "id": "M\u00fcller-Markus-P", "name": { "family": "M\u00fcller", "given": "Markus" }, "orcid": "0000-0002-0299-952X" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Light-induced evaporative cooling of holes in the Hubbard model", "ispublished": "pub", "full_text_status": "public", "keywords": "Electronic properties and materials; Theoretical physics", "note": "\u00a9 2019 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. \n\nReceived 18 April 2019; Accepted 14 November 2019; Published 05 December 2019. \n\nWe thank A.J. Millis for helpful discussions. The calculations have been performed on the Beo04 cluster at the University of Fribourg, using a software library co-developed by H. Strand. This work has been supported by the European Research Council through ERC Consolidator Grant no. 724103 (P.W.) and ERC Starting Grant no. 716648 (M.E.). G.R. acknowledges the support from the ARO MURI W911NF-16-1-0361 Quantum Materials by Design with Electromagnetic Excitation sponsored by the U.S. Army, from the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, and from the Packard Foundation. This work was initiated at the Aspen Center for Physics, during the 2018 Summer Program. P.W. and G.R. thank the ACP for its hospitality. \n\nData availability: The data that support the findings of this study are available from the corresponding author upon reasonable request. \n\nCode availability: The codes used to produce the results of this study are based on a proprietary software library, which will be documented and published in the future. \n\nAuthor Contributions: P.W. conceived the idea, performed the calculations, and wrote the paper with the help of M.E., M.M., and G.R. All authors contributed to the discussion and interpretation of the results. \n\nThe authors declare no competing interests.\n\nPublished - s41467-019-13557-9.pdf
Submitted - 1904.00822.pdf
", "abstract": "An elusive goal in the field of driven quantum matter is the induction of long-range order. Here, we propose a mechanism based on light-induced evaporative cooling of holes in a correlated fermionic system. Since the entropy of a filled narrow band grows rapidly with hole doping, the isentropic transfer of holes from a doped Mott insulator to such a band results in a drop of temperature. Strongly correlated Fermi liquids and symmetry-broken states could thus be produced by dipolar excitations. Using nonequilibrium dynamical mean field theory, we show that suitably designed chirped pulses may realize this cooling effect. In particular, we demonstrate the emergence of antiferromagnetic order in a system which is initially in a weakly correlated state above the maximum N\u00e9el temperature. Our work suggests a general strategy for inducing strong correlation phenomena in periodically modulated atomic gases in optical lattices or light-driven materials.", "date": "2019-12-05", "date_type": "published", "publication": "Nature Communications", "volume": "10", "publisher": "Nature Publishing Group", "pagerange": "Art. No. 5556", "id_number": "CaltechAUTHORS:20190425-142141029", "issn": "2041-1723", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190425-142141029", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "European Research Council (ERC)", "grant_number": "724103" }, { "agency": "European Research Council (ERC)", "grant_number": "716648" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1038/s41467-019-13557-9", "pmcid": "PMC6895176", "primary_object": { "basename": "1904.00822.pdf", "url": "https://authors.library.caltech.edu/records/jhm99-py963/files/1904.00822.pdf" }, "related_objects": [ { "basename": "s41467-019-13557-9.pdf", "url": "https://authors.library.caltech.edu/records/jhm99-py963/files/s41467-019-13557-9.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Werner, Philipp; Eckstein, Martin; et el." }, { "id": "https://authors.library.caltech.edu/records/a69vz-3xp68", "eprint_id": 95011, "eprint_status": "archive", "datestamp": "2023-08-19 18:26:18", "lastmod": "2023-10-20 22:12:29", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Choi-Youngjoon", "name": { "family": "Choi", "given": "Youngjoon" } }, { "id": "Kemmer-Jeanette", "name": { "family": "Kemmer", "given": "Jeannette" } }, { "id": "Peng-Yang", "name": { "family": "Peng", "given": "Yang" }, "orcid": "0000-0002-8868-2928" }, { "id": "Thomson-Alex", "name": { "family": "Thomson", "given": "Alex" }, "orcid": "0000-0002-9938-5048" }, { "id": "Arora-H-S", "name": { "family": "Arora", "given": "Harpreet" }, "orcid": "0000-0002-7674-735X" }, { "id": "Polski-R-M", "name": { "family": "Polski", "given": "Robert" }, "orcid": "0000-0003-0887-8099" }, { "id": "Zhang-Yiran", "name": { "family": "Zhang", "given": "Yiran" }, "orcid": "0000-0002-8477-0074" }, { "id": "Ren-Hechen", "name": { "family": "Ren", "given": "Hechen" } }, { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } }, { "id": "Watanabe-Kenji", "name": { "family": "Watanabe", "given": "Kenji" }, "orcid": "0000-0003-3701-8119" }, { "id": "Taniguchi-Takashi", "name": { "family": "Taniguchi", "given": "Takashi" } }, { "id": "Nadj-Perge-S", "name": { "family": "Nadj-Perge", "given": "Stevan" }, "orcid": "0000-0002-2394-9070" } ] }, "title": "Electronic correlations in twisted bilayer graphene near the magic angle", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 Springer Nature Publishing AG. \n\nReceived 28 January 2019; Accepted 26 June 2019; Published\n05 August 2019. \n\nData availability: The experimental data and analyses that support the plots within this paper and the findings of this study are available from the corresponding author upon reasonable request. \n\nCode availability: The computer codes that support the plots within this paper and the findings of this study are available from the corresponding author upon reasonable request. \n\nWe gratefully acknowledge discussions with R. C. Ashoori, P. Jarillo-Herrero, A. Vishwanath, J. Eisenstein, A. Young and H. Beidenkopf. The STM work is in part supported by NSF DMR-1744011. Sample fabrication efforts are supported by the NSF through program NSF CAREER DMR-1753306. S.N.-P. acknowledges support from a KNI-Weathley fellowship. J.A., G.R., F.v.O., S.N.-P. and H.R. acknowledge the support of IQIM (NSF funded physics frontiers center). J.K. acknowledges support from the Deutsche Forschungsgemeinschaft (DFG 406557161), Y.C. a Kwanjeong fellowship, F.v.O. DFG support through CRC 183, and J.A. support from the Army Research Office under grant award W911NF-17-1-0323 and the NSF through grant DMR-1723367. Y.P., A.T. and J.A. are grateful for support from the Walter Burke Institute for Theoretical Physics at Caltech. \n\nAuthor Contributions: Y.C., J.K. and S.N.-P. conceived the experiment. Y.C. and J.K. performed the measurements. Y.C. made the samples with the help of H.A., R.P. and Y.Z. Y.C., J.K., H.R. and S.N.-P. performed data analysis. Y.P. and A.T. developed the theory guided by F.v.O., J.A. and G.R. Y.C., J.K. and S.N.-P. wrote the manuscript with input from all authors. \n\nThe authors declare no competing interests.\n\nIn the version of this Article originally published online, the funding support for J.A. from the Army Research Office was inadvertently left out of the Acknowledgements; the information has now been added to the penultimate sentence, which now ends \"J.A. support from the Army Research Office under grant award W911NF-17-1-0323 and the NSF through grant DMR-1723367.\" All versions of this Article have been amended.\n\nSubmitted - 1901.02997.pdf
Supplemental Material - 41567_2019_606_MOESM1_ESM.pdf
", "abstract": "Twisted bilayer graphene with a twist angle of around 1.1\u00b0 features a pair of isolated flat electronic bands and forms a platform for investigating strongly correlated electrons. Here, we use scanning tunnelling microscopy to probe the local properties of highly tunable twisted bilayer graphene devices and show that the flat bands deform when aligned with the Fermi level. When the bands are half-filled, we observe the development of gaps originating from correlated insulating states. Near charge neutrality, we find a previously unidentified correlated regime featuring an enhanced splitting of the flat bands. We describe this within a microscopic model that predicts a strong tendency towards nematic ordering. Our results provide insights into symmetry-breaking correlation effects and highlight the importance of electronic interactions for all filling fractions in twisted bilayer graphene.", "date": "2019-11", "date_type": "published", "publication": "Nature Physics", "volume": "15", "number": "11", "publisher": "Nature Publishing Group", "pagerange": "1174-1180", "id_number": "CaltechAUTHORS:20190426-084652512", "issn": "1745-2473", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190426-084652512", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-1744011" }, { "agency": "NSF", "grant_number": "DMR-1753306" }, { "agency": "Kavli Nanoscience Institute" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "406557161" }, { "agency": "Kwanjeong Educational Foundation" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "CRC 183" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-17-1-0323" }, { "agency": "NSF", "grant_number": "DMR-1723367" }, { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Kavli-Nanoscience-Institute" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1038/s41567-019-0606-5", "primary_object": { "basename": "1901.02997.pdf", "url": "https://authors.library.caltech.edu/records/a69vz-3xp68/files/1901.02997.pdf" }, "related_objects": [ { "basename": "41567_2019_606_MOESM1_ESM.pdf", "url": "https://authors.library.caltech.edu/records/a69vz-3xp68/files/41567_2019_606_MOESM1_ESM.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Choi, Youngjoon; Kemmer, Jeannette; et el." }, { "id": "https://authors.library.caltech.edu/records/jv3qq-yxr73", "eprint_id": 94979, "eprint_status": "archive", "datestamp": "2023-08-19 17:42:10", "lastmod": "2023-10-20 18:27:47", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Savitz-S", "name": { "family": "Savitz", "given": "Samuel" }, "orcid": "0000-0003-2112-3758" }, { "id": "Peng-Changnan", "name": { "family": "Peng", "given": "Changnan" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Anderson Localization on the Bethe Lattice using Cages and the Wegner Flow", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 American Physical Society. \n\nReceived 17 June 2019; revised manuscript received 28 August 2019; published 16 September 2019. \n\nThanks to Evert van Nieuwenburg, Yuval Baum, Stefan Kehrein, and Matthew Heydeman for fruitful discussions, and to Konstantin Tikhonov, Gabriel Lemari\u00e9, Steven Thompson, and our two anonymous referees for their feedback and suggestions regarding our preprint. This work was supported by the Institute for Quantum Information and Matter (IQIM), a National Science Foundation (NSF) frontier center partially funded by the Gordon and Betty Moore Foundation. S.S. was funded by Grant No. DGE-1745301 from the NSF Graduate Research Fellowship. C.P. thanks the Caltech Student\u2013Faculty Programs office and the Blinkenberg family for their support. G.R. acknowledges the generous support of the Packard Foundation and the IQIM. \n\nThe numerical Wegner flows were implemented using floating-point matrices calculated by the open-source linear algebra library ARMADILLO [114].\n\nPublished - PhysRevB.100.094201.pdf
Submitted - 1904.07252.pdf
", "abstract": "Anderson localization on treelike graphs such as the Bethe lattice, Cayley tree, or random regular graphs has attracted attention due to its apparent mathematical tractability, hypothesized connections to many-body localization, and the possibility of nonergodic extended regimes. This behavior has been conjectured to also appear in many-body localization as a \"bad metal\" phase, and constitutes an intermediate possibility between the extremes of ergodic quantum chaos and integrable localization. Despite decades of research, a complete consensus understanding of this model remains elusive. Here we use cages, maximally treelike structures from extremal graph theory; and numerical continuous unitary Wegner flows of the Anderson Hamiltonian to develop an intuitive picture which, after extrapolating to the infinite Bethe lattice, appears to capture ergodic, nonergodic extended, and fully localized behavior.", "date": "2019-09-01", "date_type": "published", "publication": "Physical Review B", "volume": "100", "number": "9", "publisher": "American Physical Society", "pagerange": "Art. No. 094201", "id_number": "CaltechAUTHORS:20190425-135640601", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190425-135640601", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "NSF Graduate Research Fellowship", "grant_number": "DGE-1745301" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.100.094201", "primary_object": { "basename": "PhysRevB.100.094201.pdf", "url": "https://authors.library.caltech.edu/records/jv3qq-yxr73/files/PhysRevB.100.094201.pdf" }, "related_objects": [ { "basename": "1904.07252.pdf", "url": "https://authors.library.caltech.edu/records/jv3qq-yxr73/files/1904.07252.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Savitz, Samuel; Peng, Changnan; et el." }, { "id": "https://authors.library.caltech.edu/records/nprf4-d0186", "eprint_id": 95058, "eprint_status": "archive", "datestamp": "2023-08-19 16:56:27", "lastmod": "2023-10-20 18:31:12", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Curtis-J-B", "name": { "family": "Curtis", "given": "Jonathan" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Galitski-V-M", "name": { "family": "Galitski", "given": "Victor" } } ] }, "title": "Evanescent Modes and Step-like Acoustic Black Holes", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 Elsevier Inc. \n\nReceived 27 February 2019, Accepted 29 April 2019, Available online 16 May 2019. \n\nThe authors would like to acknowledge productive discussions with Justin Wilson, Aydin Keser, Greg Gabadadze, Brian Swingle, and Iacopo Carusotto. This work was supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE 1322106 (JC) and US-ARO (contract No. W911NF1310172), nsf-dmr 1613029, and Simons Foundation (VG). GR is grateful for the IQIM, an NSF Frontier center, and both GR and VG are grateful for the hospitality of the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607761, where part of the work was done.\n\nSubmitted - 1801.01607.pdf
", "abstract": "We consider a model of an acoustic black hole formed by a quasi-one dimensional Bose\u2013Einstein condensate with a step-like horizon. This system is analyzed by solving the corresponding Bogoliubov\u2013de Gennes equation with an appropriate matching condition at the jump. When the step is between a subsonic and supersonic flow, a sonic horizon develops and in addition to the scattering coefficients we compute the distribution of the accompanying analogue Hawking radiation. Additionally, in response to the abrupt variation in flow and non-linear Bogoliubov dispersion relation, evanescent solutions of the Bogoliubov\u2013de Gennes equation also appear and decay out from the horizon. We bound this decay length and show that these modes produce a modulation of observables outside the event horizon by their interference with outgoing Hawking flux. We go further and find specific superpositions of ingoing eigenmodes which exhibit coherent cancellation of the Hawking flux outside the horizon but nevertheless have evanescent support outside the black hole. We conclude by speculating that when quasiparticle interactions are included, evanescent modes may yield a leakage of information across the event horizon via interactions between the real outgoing Hawking flux and the virtual evanescent modes, and that we may expect this as a generic feature of models which break Lorentz invariance at the UV (Planck) scale.", "date": "2019-08", "date_type": "published", "publication": "Annals of Physics", "volume": "407", "publisher": "Elsevier", "pagerange": "148-165", "id_number": "CaltechAUTHORS:20190426-161745452", "issn": "0003-4916", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190426-161745452", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF Graduate Research Fellowship", "grant_number": "DGE-1322106" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-1310172" }, { "agency": "NSF", "grant_number": "DMR-1613029" }, { "agency": "Simons Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF", "grant_number": "PHY-1607761" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1016/j.aop.2019.04.017", "primary_object": { "basename": "1801.01607.pdf", "url": "https://authors.library.caltech.edu/records/nprf4-d0186/files/1801.01607.pdf" }, "resource_type": "article", "pub_year": "2019", "author_list": "Curtis, Jonathan; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/ycyzs-xgz74", "eprint_id": 95065, "eprint_status": "archive", "datestamp": "2023-08-19 16:45:54", "lastmod": "2023-10-20 18:31:35", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bauer-B", "name": { "family": "Bauer", "given": "Bela" }, "orcid": "0000-0001-9796-2115" }, { "id": "Pereg-Barnea-T", "name": { "family": "Pereg-Barnea", "given": "T." } }, { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Rieder-M-T", "name": { "family": "Rieder", "given": "Maria-Theresa" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Berg-E", "name": { "family": "Berg", "given": "Erez" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } } ] }, "title": "Topologically protected braiding in a single wire using Floquet Majorana modes", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 American Physical Society. \n\nReceived 1 November 2018; revised manuscript received 4 April 2019; published 3 July 2019. \n\nThis work was supported by NSERC DG (T.P.-B.), the BSF and ISF grants and by the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC Grant Agreement MUNATOP No. 340210, and under the European Union's Horizon 2020 Research and Innovation Programme (Grant Agreement LEGOTOP No. 788715) (Y.O.). Y.O. and E.B. acknowledge support from CRC 183 of the Deutsche Forschungsgemeinschaft. G.R. is grateful for support from the Institute of Quantum Information and Matter, an NSF frontier center with support from the Gordon and Betty Moore Foundation, as well as the Packard Foundation. We are also grateful for the hospitality of the Aspen Center for Physics, which is supported by National Science Foundation Grant No. PHY-1607761, and where part of the work was done.\n\nPublished - PhysRevB.100.041102.pdf
Submitted - 1808.07066.pdf
Supplemental Material - braiding_supplemental.pdf
", "abstract": "Majorana zero modes are a promising platform for topologically protected quantum information processing. Their non-Abelian nature, which is key for performing quantum gates, is most prominently exhibited through braiding. While originally formulated for two-dimensional systems, it has been shown that braiding can also be realized using one-dimensional wires by forming an essentially two-dimensional network. Here, we show that in driven systems far from equilibrium, one can do away with the second spatial dimension altogether by instead using quasienergy as the second dimension. To realize this, we use a Floquet topological superconductor which can exhibit Majorana modes at two special eigenvalues of the evolution operator, 0 and \u03c0, and thus can realize four Majorana modes in a single, driven quantum wire. We describe and numerically evaluate a protocol that realizes a topologically protected exchange of two Majorana zero modes in a single wire by adiabatically modulating the Floquet drive and using the \u03c0 modes as auxiliary degrees of freedom.", "date": "2019-07-15", "date_type": "published", "publication": "Physical Review B", "volume": "100", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 041102", "id_number": "CaltechAUTHORS:20190429-083156058", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190429-083156058", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Natural Sciences and Engineering Research Council of Canada (NSERC)" }, { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "Israel Science Foundation" }, { "agency": "European Research Council (ERC)", "grant_number": "340210" }, { "agency": "European Research Council (ERC)", "grant_number": "788715" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "CRC 183" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "PHY-1607761" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevB.100.041102", "primary_object": { "basename": "1808.07066.pdf", "url": "https://authors.library.caltech.edu/records/ycyzs-xgz74/files/1808.07066.pdf" }, "related_objects": [ { "basename": "PhysRevB.100.041102.pdf", "url": "https://authors.library.caltech.edu/records/ycyzs-xgz74/files/PhysRevB.100.041102.pdf" }, { "basename": "braiding_supplemental.pdf", "url": "https://authors.library.caltech.edu/records/ycyzs-xgz74/files/braiding_supplemental.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Bauer, Bela; Pereg-Barnea, T.; et el." }, { "id": "https://authors.library.caltech.edu/records/j1y13-y2424", "eprint_id": 94587, "eprint_status": "archive", "datestamp": "2023-08-19 16:42:01", "lastmod": "2023-10-20 18:05:33", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Peng-Yang", "name": { "family": "Peng", "given": "Yang" }, "orcid": "0000-0002-8868-2928" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Floquet second-order topological insulators from nonsymmorphic space-time symmetries", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 American Physical Society. \n\nReceived 28 November 2018; published 3 July 2. \n\nWe acknowledge support from the Institute of Quantum Information and Matter, a NSF Frontier center funded by the Gordon and Betty Moore Foundation, and the Packard Foundation. Y.\u2009P. is grateful for support from the Walter Burke Institute for Theoretical Physics at Caltech. G.\u2009R. is grateful for support from the ARO MURI W911NF-16-1- 0361 Quantum Materials by Design with Electromagnetic Excitation sponsored by the U.S. Army.\n\nPublished - PhysRevLett.123.016806.pdf
Submitted - 1811.11752.pdf
Supplemental Material - supplement.pdf
", "abstract": "We propose a systematic way of constructing Floquet second-order topological insulators (SOTIs) based on time-glide symmetry, a nonsymmorphic space-time symmetry that is unique in Floquet systems. In particular, we are able to show that the static enlarged Hamiltonian in the frequency domain acquires reflection symmetry, which is inherited from the time-glide symmetry of the original system. As a consequence, one can construct a variety of time-glide symmetric Floquet SOTIs using the knowledge of static SOTIs. Moreover, the time-glide symmetry only needs to be implemented approximately in practice, enhancing the prospects of experimental realizations. We consider two examples, a 2D system in class AIII and a 3D system in class A, to illustrate our ideas, and then present a general recipe for constructing Floquet SOTIs in all symmetry classes.", "date": "2019-07-03", "date_type": "published", "publication": "Physical Review Letters", "volume": "123", "number": "1", "publisher": "American Physical Society", "pagerange": "Art. No. 016806", "id_number": "CaltechAUTHORS:20190409-112427983", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190409-112427983", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevLett.123.016806", "primary_object": { "basename": "1811.11752.pdf", "url": "https://authors.library.caltech.edu/records/j1y13-y2424/files/1811.11752.pdf" }, "related_objects": [ { "basename": "PhysRevLett.123.016806.pdf", "url": "https://authors.library.caltech.edu/records/j1y13-y2424/files/PhysRevLett.123.016806.pdf" }, { "basename": "supplement.pdf", "url": "https://authors.library.caltech.edu/records/j1y13-y2424/files/supplement.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Peng, Yang and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/jk5ad-65w58", "eprint_id": 95602, "eprint_status": "archive", "datestamp": "2023-08-19 19:01:32", "lastmod": "2023-10-20 20:22:52", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chaudhary-Swati", "name": { "family": "Chaudhary", "given": "Swati" } }, { "id": "Hsieh-David", "name": { "family": "Hsieh", "given": "David" }, "orcid": "0000-0002-0812-955X" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Orbital Floquet Engineering of Exchange Interactions in Magnetic Materials", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 American Physical Society. \n\nReceived 3 June 2019; published 9 December 2019. \n\nWe acknowledge support from the IQIM, an NSF physics frontier center funded by the Gordon and Betty Moore Foundation. We are grateful for support from ARO MURI W911NF-16-1-0361 \"Quantum Materials by Design with Electromagnetic Excitation\" sponsored by the US Army.\n\nPublished - PhysRevB.100.220403.pdf
Submitted - 1905.03921.pdf
Supplemental Material - supplemental_info.pdf
", "abstract": "We present a scheme to control the spin-exchange interactions by manipulating the orbital degrees of freedom using a periodic drive. We discuss two different protocols for orbital Floquet engineering. In one case, a periodic drive modifies the properties of the ligand orbitals which mediate magnetic interactions between transition-metal ions. In the other case, we consider drive-induced mixing of d orbitals on each magnetic ion. We first find that an AC Stark shift of orbitals induces a change comparable to that induced from photoinduced hopping schemes, but expands the applicable frequency ranges. Next, we find that radiatively induced coherent vibrations provide a realistic path for Floquet orbital engineering with short pulses of electric fields weaker than 0.5 V/\u00c5 producing 5%\u201310% changes in the magnetic coupling of Mott insulators such as the rare-earth titanates.", "date": "2019-05-20", "date_type": "published", "publication": "Physical Review B", "volume": "100", "number": "22", "publisher": "American Physical Society", "pagerange": "Art. No. 220403", "id_number": "CaltechAUTHORS:20190520-132243974", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190520-132243974", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.100.220403", "primary_object": { "basename": "1905.03921.pdf", "url": "https://authors.library.caltech.edu/records/jk5ad-65w58/files/1905.03921.pdf" }, "related_objects": [ { "basename": "PhysRevB.100.220403.pdf", "url": "https://authors.library.caltech.edu/records/jk5ad-65w58/files/PhysRevB.100.220403.pdf" }, { "basename": "supplemental_info.pdf", "url": "https://authors.library.caltech.edu/records/jk5ad-65w58/files/supplemental_info.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Chaudhary, Swati; Hsieh, David; et el." }, { "id": "https://authors.library.caltech.edu/records/ae414-pmm25", "eprint_id": 88991, "eprint_status": "archive", "datestamp": "2023-08-22 01:33:53", "lastmod": "2023-10-23 16:10:28", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "van-Nieuwenburg-E-P-L", "name": { "family": "van Nieuwenburg", "given": "Evert" }, "orcid": "0000-0003-0323-0031" }, { "id": "Baum-Y", "name": { "family": "Baum", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "From Bloch Oscillations to Many Body Localization in Clean Interacting Systems", "ispublished": "pub", "full_text_status": "public", "keywords": "many-body localization; Stark; thermalization; ergodicity", "note": "\u00a9 2019 National Academy of Sciences. Published under the PNAS license. \n\nEdited by Angel Rubio, Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany, and approved March 29, 2019 (received for review November 9, 2018). \n\nThis work was supported by Swiss National Science Foundation Grant P2EZP2-172185 (to E.v.N.), Army Research Office Multidisciplinary University Research Initiative W911NF-16-1-0361, \"Quantum Materials by Design with Electromagnetic Excitation,\" sponsored by the US Army and the Packard Foundation (G.R.), and the Institute for Quantum Information and Matter, an NSF Physics Frontier Center funded in part by the Moore Foundation. \n\nAuthor contributions: E.v.N., Y.B., and G.R. designed research, performed research, analyzed data, and wrote the paper. \n\nThe authors declare no conflict of interest. \n\nThis article is a PNAS Direct Submission. \n\nData deposition: The C++ code developed for this work has been deposited in GitHub, https://www.github.com/everthemore/krylov-cpp, and the data for Fig. 3 have been deposited in CaltechData, https://data.caltech.edu/records/1089. \n\nThis article contains supporting information online at www.pnas.org/lookup/suppl/doi:10.1073/pnas.1819316116/-/DCSupplemental.\n\nPublished - 9269.full.pdf
Submitted - 1808.00471.pdf
Supplemental Material - pnas.1819316116.sapp.pdf
", "abstract": "In this work we demonstrate that nonrandom mechanisms that lead to single-particle localization may also lead to many-body localization, even in the absence of disorder. In particular, we consider interacting spins and fermions in the presence of a linear potential. In the noninteracting limit, these models show the well-known Wannier\u2013Stark localization. We analyze the fate of this localization in the presence of interactions. Remarkably, we find that beyond a critical value of the potential gradient these models exhibit nonergodic behavior as indicated by their spectral and dynamical properties. These models, therefore, constitute a class of generic nonrandom models that fail to thermalize. As such, they suggest new directions for experimentally exploring and understanding the phenomena of many-body localization. We supplement our work by showing that by using machine-learning techniques the level statistics of a system may be calculated without generating and diagonalizing the Hamiltonian, which allows a generation of large statistics.", "date": "2019-05-07", "date_type": "published", "publication": "Proceedings of the National Academy of Sciences of the United States of America", "volume": "116", "number": "19", "publisher": "National Academy of Sciences", "pagerange": "9269-9274", "id_number": "CaltechAUTHORS:20180821-144923153", "issn": "0027-8424", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180821-144923153", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Swiss National Science Foundation (SNSF)", "grant_number": "P2EZP2-172185" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1073/pnas.1819316116", "pmcid": "PMC6511026", "primary_object": { "basename": "1808.00471.pdf", "url": "https://authors.library.caltech.edu/records/ae414-pmm25/files/1808.00471.pdf" }, "related_objects": [ { "basename": "9269.full.pdf", "url": "https://authors.library.caltech.edu/records/ae414-pmm25/files/9269.full.pdf" }, { "basename": "pnas.1819316116.sapp.pdf", "url": "https://authors.library.caltech.edu/records/ae414-pmm25/files/pnas.1819316116.sapp.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "van Nieuwenburg, Evert; Baum, Yuval; et el." }, { "id": "https://authors.library.caltech.edu/records/5ra36-xec93", "eprint_id": 94942, "eprint_status": "archive", "datestamp": "2023-08-19 15:18:41", "lastmod": "2023-10-20 18:25:33", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Freedman-M-H", "name": { "family": "Freedman", "given": "Michael H." } } ] }, "title": "Robust Majorana magic gates via measurements", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 American Physical Society. \n\n(Received 12 February 2019; revised manuscript received 4 April 2019; published 24 April 2019) \n\nWe acknowledge useful discussions with Christina Knapp and Parsa Bonderson. We are grateful for the hospitality of the Aspen Center for Physics, where part of this work was performed. GR is grateful for support from the Institute of Quantum Information and Matter, an NSF frontier center. YO acknowledges the European Research Council under the European Union's Seventh Framework Program (FP7/2007-2013)/ERC Project MUNATOP, the DFG (CRC/Transregio 183, EI 519/7-1), and the Israel Science Foundation and the United States - Israel Binational Science Foundation.\n\nPublished - PhysRevB.99.144521.pdf
Accepted Version - 1812.10498.pdf
", "abstract": "\u03c0/8 phase gates (magic gates or T gates) are crucial to augment topological systems based on Majorana zero modes to full quantum universality. We present a scheme based on a combination of projective measurements and nonadiabatic evolution that effectively cancels smooth control errors when implementing phase gates in Majorana-based systems. Previous schemes based on adiabatic evolution are susceptible to problems arising from small but finite dynamical phases that are generically present in topologically unprotected gates. A measurement-only approach eliminates dynamical phases. For nonprotected gates, however, forced-measurement schemes are no longer effective, which leads to low success probabilities of obtaining the right succession of measurement outcomes in a measurement-only implementation. We show how to obtain a viable measurement-based scheme which dramatically increases the success probabilities by evolving the system nonadiabatically with respect to the degenerate subspace in between measurements. We outline practical applications of our scheme in recently proposed quantum computing designs based on Majorana tetrons and hexons.", "date": "2019-04-01", "date_type": "published", "publication": "Physical Review B", "volume": "99", "number": "14", "publisher": "American Physical Society", "pagerange": "Art. No. 144521", "id_number": "CaltechAUTHORS:20190424-142039996", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190424-142039996", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF" }, { "agency": "European Research Council (ERC)", "grant_number": "MUNATOP" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "EI 519/7-1" }, { "agency": "Israel Science Foundation" }, { "agency": "Binational Science Foundation (USA-Israel)" } ] }, "local_group": { "items": [ { "id": "Walter-Burke-Institute-for-Theoretical-Physics" }, { "id": "IQIM" } ] }, "doi": "10.1103/physrevb.99.144521", "primary_object": { "basename": "1812.10498.pdf", "url": "https://authors.library.caltech.edu/records/5ra36-xec93/files/1812.10498.pdf" }, "related_objects": [ { "basename": "PhysRevB.99.144521.pdf", "url": "https://authors.library.caltech.edu/records/5ra36-xec93/files/PhysRevB.99.144521.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Karzig, Torsten; Oreg, Yuval; et el." }, { "id": "https://authors.library.caltech.edu/records/0ez7e-5r391", "eprint_id": 94123, "eprint_status": "archive", "datestamp": "2023-08-19 14:43:00", "lastmod": "2023-10-20 17:42:28", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Nathan-F", "name": { "family": "Nathan", "given": "Frederik" } }, { "id": "Martin-I", "name": { "family": "Martin", "given": "Ivar" }, "orcid": "0000-0002-2010-6449" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Topological frequency conversion in a driven dissipative quantum cavity", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 American Physical Society. \n\nReceived 18 December 2018; revised manuscript received 5 March 2019; published 25 March 2019. \n\nF.N. acknowledges financial support from the Villum Foundation and the Danish National Research Foundation. Work at Argonne National Laboratory was supported by the Department of Energy, Office of Science, Materials Science and Engineering Division. G.R. is grateful for support from the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, the Packard Foundation, and from the ARO MURI W911NF-16-1-0361 \"Quantum Materials by Design with Electromagnetic Excitation\" sponsored by the U. S. Army. I.M. and G.R. are grateful for the hospitality of the Aspen Center for Physics, supported by National Science Foundation Grant No. PHY-1607611.\n\nPublished - PhysRevB.99.094311.pdf
Submitted - 1811.02222.pdf
", "abstract": "Recent work [Martin et al., Phys. Rev. X 7, 041008 (2017)] shows that a spin coupled to two externally supplied circularly polarized electromagnetic modes can effectuate a topological, quantized transfer of photons from one mode to the other. Here, we study the effect in the case when only one of the modes is externally provided, while the other is a dynamical quantum mechanical cavity mode. Focusing on the signatures and stability under experimentally accessible conditions, we show that the effect persists down to the few-photon quantum limit and that it can be used to generate highly entangled \"cat states\" of cavity and spin. By tuning the strength of the external drive to a \"sweet spot,\" the quantized pumping can arise starting from an empty (zero-photon) cavity state. We also find that inclusion of external noise and dissipation does not suppress but rather stabilizes the conversion effect, even after multiple cavity modes are taken into account.", "date": "2019-03-01", "date_type": "published", "publication": "Physical Review B", "volume": "99", "number": "9", "publisher": "American Physical Society", "pagerange": "Art. No. 094311", "id_number": "CaltechAUTHORS:20190325-132537557", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190325-132537557", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Villum Foundation" }, { "agency": "Danish National Research Foundation" }, { "agency": "Department of Energy (DOE)" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.99.094311", "primary_object": { "basename": "1811.02222.pdf", "url": "https://authors.library.caltech.edu/records/0ez7e-5r391/files/1811.02222.pdf" }, "related_objects": [ { "basename": "PhysRevB.99.094311.pdf", "url": "https://authors.library.caltech.edu/records/0ez7e-5r391/files/PhysRevB.99.094311.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Nathan, Frederik; Martin, Ivar; et el." }, { "id": "https://authors.library.caltech.edu/records/89ta9-3f917", "eprint_id": 82075, "eprint_status": "archive", "datestamp": "2023-08-19 13:43:26", "lastmod": "2023-10-17 22:01:26", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Yunger-Halpern-N", "name": { "family": "Yunger Halpern", "given": "Nicole" }, "orcid": "0000-0001-8670-6212" }, { "id": "White-C-D", "name": { "family": "White", "given": "Christopher David" } }, { "id": "Gopalakrishnan-S", "name": { "family": "Gopalakrishnan", "given": "Sarang" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Quantum engine based on many-body localization", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 American Physical Society. \n\nReceived 25 July 2017; revised manuscript received 17 December 2018; published 22 January 2019. \n\nThis research was supported by NSF grant PHY-0803371. \n\nThe Institute for Quantum Information and Matter (IQIM) is an NSF Physics Frontiers Center supported by the Gordon and Betty Moore Foundation. N.Y.H. is grateful for partial support from the Walter Burke Institute for Theoretical Physics at Caltech and for a Barbara Groce Graduate Fellowship. This material is based on work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144469. S.G. acknowledges support from the Walter Burke Foundation and from the NSF under Grant No. DMR-1653271. G.R. acknowledges support from the David and Lucile Packard Foundation. N.Y.H. thanks Nana Liu and \u00c1lvaro Mart\u00edn Alhambra for discussions.\n\nPublished - PhysRevB.99.024203.pdf
Submitted - 1707.07008.pdf
", "abstract": "Many-body-localized (MBL) systems do not thermalize under their intrinsic dynamics. The athermality of MBL, we propose, can be harnessed for thermodynamic tasks. We illustrate this ability by formulating an Otto engine cycle for a quantum many-body system. The system is ramped between a strongly localized MBL regime and a thermal (or weakly localized) regime. The difference between the energy-level correlations of MBL systems and of thermal systems enables mesoscale engines to run in parallel in the thermodynamic limit, enhances the engine's reliability, and suppresses worst-case trials. We estimate analytically and calculate numerically the engine's efficiency and per-cycle power. The efficiency mirrors the efficiency of the conventional thermodynamic Otto engine. The per-cycle power scales linearly with the system size and inverse-exponentially with a localization length. This work introduces a thermodynamic lens onto MBL, which, having been studied much recently, can now be considered for use in thermodynamic tasks.", "date": "2019-01-01", "date_type": "published", "publication": "Physical Review B", "volume": "99", "number": "2", "publisher": "American Physical Society", "pagerange": "Art. No. 024203", "id_number": "CaltechAUTHORS:20171004-143754557", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-143754557", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "PHY-0803371" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" }, { "agency": "Barbara Groce Graduate Fellowship, Caltech" }, { "agency": "NSF Graduate Research Fellowship", "grant_number": "DGE-1144469" }, { "agency": "NSF", "grant_number": "DMR-1653271" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevB.99.024203", "primary_object": { "basename": "1707.07008.pdf", "url": "https://authors.library.caltech.edu/records/89ta9-3f917/files/1707.07008.pdf" }, "related_objects": [ { "basename": "PhysRevB.99.024203.pdf", "url": "https://authors.library.caltech.edu/records/89ta9-3f917/files/PhysRevB.99.024203.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Yunger Halpern, Nicole; White, Christopher David; et el." }, { "id": "https://authors.library.caltech.edu/records/dxbnv-cs375", "eprint_id": 87714, "eprint_status": "archive", "datestamp": "2023-08-19 13:43:41", "lastmod": "2023-10-18 21:23:16", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Seetharam-K-I", "name": { "family": "Seetharam", "given": "Karthik I." } }, { "id": "Bardyn-C-E", "name": { "family": "Bardyn", "given": "Charles-Edouard" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Rudner-M-S", "name": { "family": "Rudner", "given": "Mark S." }, "orcid": "0000-0002-5150-6234" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Steady state of interacting Floquet insulators", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2019 American Physical Society. \n\nReceived 3 July 2018; revised manuscript received 11 November 2018; published 30 January 2019. \n\nWe thank L. Glazman, Yuval Baum, Evert van Nieuwenburg, Justin Wilson, Michael Buchhold, and Min-Feng Tu, for useful discussions. N.L. acknowledges support from the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 639172); from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013), under REA Grant Agreement No. 631696; and from the Israeli Center of Research Excellence (I-CORE) \"Circle of Light\" funded by the Israel Science Foundation (Grant No. 1802/12). M.R. gratefully acknowledges the support from the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 678862) and from the Villum Foundation. C.-E.B. gratefully acknowledges support by the Swiss National Science Foundation under Division II. G.R. and K.S. are grateful for support from the NSF through DMR-1410435; from the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation; from the Packard Foundation; and from the ARO MURI W911NF-16-1-0361 \"Quantum Materials by Design with Electromagnetic Excitation\" sponsored by the U.S. Army. K.S. is additionally grateful for support from NSF Graduate Research Fellowship Program.\n\nPublished - PhysRevB.99.014307.pdf
Submitted - 1806.10620.pdf
", "abstract": "Floquet engineering offers tantalizing opportunities for controlling the dynamics of quantum many-body systems and realizing new nonequilibrium phases of matter. However, this approach faces a major challenge: generic interacting Floquet systems absorb energy from the drive, leading to uncontrolled heating which washes away the sought-after behavior. How to achieve and control a nontrivial nonequilibrium steady state is therefore of crucial importance. In this work, we study the dynamics of an interacting one-dimensional periodically driven electronic system coupled to a phonon heat bath. Using the Floquet-Boltzmann equation (FBE) we show that the electronic populations of the Floquet eigenstates can be controlled by the dissipation. We find the regime in which the steady state features an insulator-like filling of the Floquet bands, with a low density of additional excitations. Furthermore, we develop a simple rate equation model for the steady state excitation density that captures the behavior obtained from the numerical solution of the FBE over a wide range of parameters.", "date": "2019-01-01", "date_type": "published", "publication": "Physical Review B", "volume": "99", "number": "1", "publisher": "American Physical Society", "pagerange": "Art. No. 014307", "id_number": "CaltechAUTHORS:20180710-135957911", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180710-135957911", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "European Research Council (ERC)", "grant_number": "639172" }, { "agency": "Marie Curie Fellowship", "grant_number": "631696" }, { "agency": "Israel Science Foundation", "grant_number": "1802/12" }, { "agency": "European Research Council (ERC)", "grant_number": "678862" }, { "agency": "Villum Foundation" }, { "agency": "Swiss National Science Foundation (SNSF)" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "NSF Graduate Research Fellowship" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.99.014307", "primary_object": { "basename": "1806.10620.pdf", "url": "https://authors.library.caltech.edu/records/dxbnv-cs375/files/1806.10620.pdf" }, "related_objects": [ { "basename": "PhysRevB.99.014307.pdf", "url": "https://authors.library.caltech.edu/records/dxbnv-cs375/files/PhysRevB.99.014307.pdf" } ], "resource_type": "article", "pub_year": "2019", "author_list": "Seetharam, Karthik I.; Bardyn, Charles-Edouard; et el." }, { "id": "https://authors.library.caltech.edu/records/5hdpy-p3298", "eprint_id": 86491, "eprint_status": "archive", "datestamp": "2023-08-19 13:07:13", "lastmod": "2023-10-18 19:39:19", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Peng-Yang", "name": { "family": "Peng", "given": "Yang" }, "orcid": "0000-0002-8868-2928" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Time-quasiperiodic topological superconductors with Majorana multiplexing", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\nReceived 15 May 2018; revised manuscript received 6 December 2018; published 21 December 2018. \n\nWe acknowledge support from the IQIM, an NSF physics frontier center funded in part by the Moore Foundation. Y.P. is grateful for support from the Walter Burke Institute for Theoretical Physics at Caltech. G.R. is grateful for support from the ARO MURI W911NF-16-1-0361 \"Quantum Materials by Design with Electromagnetic Excitation\" sponsored by the U.S. Army, as well as to the Aspen Center for Physics, supported by National Science Foundation Grant No. PHY-1607761, where part of the work was done.\n\nPublished - PhysRevB.98.220509.pdf
Submitted - 1805.01896.pdf
Supplemental Material - supplement.pdf
", "abstract": "Time-quasiperiodic Majoranas are generalizations of Floquet Majoranas in time-quasiperiodic superconducting systems. We show that in a system driven at d mutually irrational frequencies, there are up to 2^d types of such Majoranas, coexisting despite spatial overlap and lack of time-translational invariance. Although the quasienergy spectrum is dense in such systems, the time-quasiperiodic Majoranas can be stable and robust against resonances due to localization in periodic-drive-induced synthetic dimensions. This is demonstrated in a time-quasiperiodic Kitaev chain driven at two frequencies. We further relate the existence of multiple Majoranas in a time-quasiperiodic system to the time-quasicrystal phase introduced recently. These time-quasiperiodic Majoranas open a possibility for braiding which will be pursued in the future.", "date": "2018-12-01", "date_type": "published", "publication": "Physical Review B", "volume": "98", "number": "22", "publisher": "American Physical Society", "pagerange": "Art. No. 220509", "id_number": "CaltechAUTHORS:20180521-093207551", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180521-093207551", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "NSF", "grant_number": "PHY-1607761" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/physrevb.98.220509", "primary_object": { "basename": "1805.01896.pdf", "url": "https://authors.library.caltech.edu/records/5hdpy-p3298/files/1805.01896.pdf" }, "related_objects": [ { "basename": "PhysRevB.98.220509.pdf", "url": "https://authors.library.caltech.edu/records/5hdpy-p3298/files/PhysRevB.98.220509.pdf" }, { "basename": "supplement.pdf", "url": "https://authors.library.caltech.edu/records/5hdpy-p3298/files/supplement.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "Peng, Yang and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/4x7fp-4sb88", "eprint_id": 87291, "eprint_status": "archive", "datestamp": "2023-08-19 11:06:58", "lastmod": "2023-10-18 21:01:08", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Baum-Y", "name": { "family": "Baum", "given": "Yuval" } }, { "id": "van-Nieuwenburg-E-P-L", "name": { "family": "van Nieuwenburg", "given": "Evert P. L." }, "orcid": "0000-0003-0323-0031" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "From dynamical localization to bunching in interacting Floquet systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 Y. Baum et al. This work is licensed under the Creative Commons Attribution 4.0 International License. Published by the SciPost Foundation. \n\nReceived 07-03-2018; Accepted 31-07-2018; Published 16-08-2018. \n\nE.v.N. gratefully acknowledges financial support from the Swiss National Science Foundation through grant P2EZP2-172185. G.R. is grateful to the NSF for funding through the grant DMR-1040435 as well as the Packard Foundation. We are grateful for support from the IQIM, an NSF physics frontier center funded in part by the Moore Foundation.\n\nPublished - SciPostPhys_5_2_017.pdf
Submitted - 1802.08262.pdf
", "abstract": "We show that a quantum many-body system may be controlled by means of Floquet engineering, i.e., their properties may be controlled and manipulated by employing periodic driving. We present a concrete driving scheme that allows control over the nature of mobile units and the amount of diffusion in generic many-body systems. We demonstrate these ideas for the Fermi-Hubbard model, where the drive renders doubly occupied sites (doublons) the mobile excitations in the system. In particular, we show that the amount of diffusion in the system and the level of fermion-pairing may be controlled and understood solely in terms of the doublon dynamics. We find that under certain circumstances the diffusion in the system may be eliminated completely. We conclude our work by generalizing these ideas to generic many-body systems.", "date": "2018-08-16", "date_type": "published", "publication": "SciPost Physics", "volume": "5", "publisher": "SciPost", "pagerange": "Art. No. 017", "id_number": "CaltechAUTHORS:20180620-195305259", "issn": "2542-4653", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180620-195305259", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Swiss National Science Foundation (SNSF)", "grant_number": "P2EZP2-172185" }, { "agency": "NSF", "grant_number": "DMR-1040435" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.21468/SciPostPhys.5.2.017", "primary_object": { "basename": "1802.08262.pdf", "url": "https://authors.library.caltech.edu/records/4x7fp-4sb88/files/1802.08262.pdf" }, "related_objects": [ { "basename": "SciPostPhys_5_2_017.pdf", "url": "https://authors.library.caltech.edu/records/4x7fp-4sb88/files/SciPostPhys_5_2_017.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "Baum, Yuval; van Nieuwenburg, Evert P. L.; et el." }, { "id": "https://authors.library.caltech.edu/records/bnmf7-v2737", "eprint_id": 86490, "eprint_status": "archive", "datestamp": "2023-08-19 10:55:16", "lastmod": "2023-10-18 19:39:16", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chaudhary-Swati", "name": { "family": "Chaudhary", "given": "Swati" } }, { "id": "Endres-M", "name": { "family": "Endres", "given": "Manuel" }, "orcid": "0000-0002-4461-224X" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Berry electrodynamics: Anomalous drift and pumping from a time-dependent Berry connection", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\n(Received 31 May 2018; published 31 August 2018) \n\nWe would like to thank Y. Baum, C. D. White, and K. Seetharam for helpful discussions. We are grateful for support from the Institute of Quantum Information and Matter, an NSF Physics frontier center funded by the Gordon and Betty Moore Foundation, and from the ARO MURI Grant No. W911NF-16-1-0361 \"Quantum Materials by Design with Electromagnetic Excitation\" sponsored by the U. S. Army. S.C. is additionally grateful for support from the Barbara Groce Graduate Fellowship. We are grateful to David Pekker and Eugene Demler for extensive discussions. G.R. gratefully acknowledges the hospitality of the Aspen Center for Physics funded by NSF Grant No. PHY-1607611.\n\nPublished - PhysRevB.98.064310.pdf
Submitted - 1805.04532.pdf
", "abstract": "The Berry curvature of a Bloch band can be interpreted as a local magnetic field in reciprocal space. This analogy can be extended by defining an electric field analog in reciprocal space which arises from the time-dependent Berry connection. We explore the term in the semiclassical equation of motion that gives rise to this phenomenon, and show that it can lead to anomalous drift in wave-packet motion. A similar effect arises from changes in the band population due to periodic driving, where the resulting drift depends on the nature of the drive and can be expressed in terms of a shift vector. Finally, these effects can be combined to build a pump with a net anomalous drift during a cyclic evolution in momentum space.", "date": "2018-08-01", "date_type": "published", "publication": "Physical Review B", "volume": "98", "number": "6", "publisher": "American Physical Society", "pagerange": "Art. No. 064310", "id_number": "CaltechAUTHORS:20180521-092304073", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180521-092304073", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "Barbara Groce Graduate Fellowship, Caltech" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.98.064310", "primary_object": { "basename": "1805.04532.pdf", "url": "https://authors.library.caltech.edu/records/bnmf7-v2737/files/1805.04532.pdf" }, "related_objects": [ { "basename": "PhysRevB.98.064310.pdf", "url": "https://authors.library.caltech.edu/records/bnmf7-v2737/files/PhysRevB.98.064310.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "Chaudhary, Swati; Endres, Manuel; et el." }, { "id": "https://authors.library.caltech.edu/records/344hq-eg740", "eprint_id": 88118, "eprint_status": "archive", "datestamp": "2023-08-19 10:55:56", "lastmod": "2023-10-18 21:48:16", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "van-Nieuwenburg-E-P-L", "name": { "family": "van Nieuwenburg", "given": "Evert" }, "orcid": "0000-0003-0323-0031" }, { "id": "Bairey-E", "name": { "family": "Bairey", "given": "Eyal" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Learning phase transitions from dynamics", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\nReceived 23 December 2017; revised manuscript received 10 April 2018; published 9 August 2018. \n\nE.v.N. gratefully acknowledges financial support from the Swiss National Science Foundation through Grant No. P2EZP2-172185. E.v.N. also acknowledges fruitful discussions with Manuel Endres. E.B. is grateful to Netanel Lindner for his support and acknowledges financial support from the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 639172). G.R. is grateful to the the NSF for funding through Grant No. DMR-1040435 as well as the Packard Foundation. We are grateful for support from the IQIM, an NSF physics frontier center funded in part by the Moore Foundation. The authors used the tensorflow [69] backend for keras [70]. \n\nE.v.N. and E.B. contributed equally to this work.\n\nPublished - PhysRevB.98.060301.pdf
Submitted - 1712.00450.pdf
Supplemental Material - supl.pdf
", "abstract": "We propose the use of recurrent neural networks for classifying phases of matter based on the dynamics of experimentally accessible observables. We demonstrate this approach by training recurrent networks on the magnetization traces of two distinct models of one-dimensional disordered and interacting spin chains. The obtained phase diagram for a well-studied model of the many-body localization transition shows excellent agreement with previously known results obtained from time-independent entanglement spectra. For a periodically driven model featuring an inherently dynamical time-crystalline phase, the phase diagram that our network traces coincides with an order parameter for its expected phases.", "date": "2018-08-01", "date_type": "published", "publication": "Physical Review B", "volume": "98", "number": "6", "publisher": "American Physical Society", "pagerange": "Art. No. 060301", "id_number": "CaltechAUTHORS:20180723-093013664", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180723-093013664", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Swiss National Science Foundation (SNSF)", "grant_number": "P2EZP2-172185" }, { "agency": "European Research Council (ERC)", "grant_number": "639172" }, { "agency": "NSF", "grant_number": "DMR-1040435" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.98.060301", "primary_object": { "basename": "PhysRevB.98.060301.pdf", "url": "https://authors.library.caltech.edu/records/344hq-eg740/files/PhysRevB.98.060301.pdf" }, "related_objects": [ { "basename": "supl.pdf", "url": "https://authors.library.caltech.edu/records/344hq-eg740/files/supl.pdf" }, { "basename": "1712.00450.pdf", "url": "https://authors.library.caltech.edu/records/344hq-eg740/files/1712.00450.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "van Nieuwenburg, Evert; Bairey, Eyal; et el." }, { "id": "https://authors.library.caltech.edu/records/gx2px-hbm14", "eprint_id": 86880, "eprint_status": "archive", "datestamp": "2023-08-19 09:48:44", "lastmod": "2023-10-18 20:40:01", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wilson-J-H", "name": { "family": "Wilson", "given": "Justin H." }, "orcid": "0000-0001-6903-0417" }, { "id": "Pixley-J-H", "name": { "family": "Pixley", "given": "J. H." } }, { "id": "Huse-D-A", "name": { "family": "Huse", "given": "David A." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Sarma-S-D", "name": { "family": "Sarma", "given": "S. Das" } } ] }, "title": "Do the surface Fermi arcs in Weyl semimetals survive disorder?", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\nReceived 15 April 2018; revised manuscript received 22 May 2018; published 7 June 2018. \n\nWe thank Pallab Goswami, Mehdi Kargarian, Rahul Nandkishore, and Jay Sau for useful discussions. This work was performed in part at the Aspen Center for Physics (J.P. and G.R.), which is supported by National Science Foundation Grant PHY-1607611. The authors are grateful for support from the Air Force Office for Scientific Research (J.W.), the Laboratory for Physical Sciences (J. P. and S.D.-S.), the Packard Foundation (G.R.), and the IQIM an NSF-PFC (G.R.). The authors acknowledge the University of Maryland supercomputing resources (http://hpcc.umd.edu), the Beowulf cluster at the Department of Physics and Astronomy of Rutgers University, The State University of New Jersey, and the Office of Advanced Research Computing (OARC) at Rutgers, The State University of New Jersey (http://oarc.rutgers.edu) for providing access to the Amarel cluster and associated research computing resources that have contributed to the results reported here.\n\nPublished - PhysRevB.97.235108.pdf
Submitted - 1801.05438.pdf
", "abstract": "We theoretically study the topological robustness of the surface physics induced by Weyl Fermi-arc surface states in the presence of short-ranged quenched disorder and surface-bulk hybridization. This is investigated with numerically exact calculations on a lattice model exhibiting Weyl Fermi arcs. We find that the Fermi-arc surface states, in addition to having a finite lifetime from disorder broadening, hybridize with nonperturbative bulk rare states making them no longer bound to the surface (i.e., they lose their purely surface spectral character). Thus, we provide strong numerical evidence that the Weyl Fermi arcs are not topologically protected from disorder. Nonetheless, the surface chiral velocity is robust and survives in the presence of strong disorder, persisting all the way to the Anderson-localized phase by forming localized current loops that live within the localization length of the surface. Thus, the Weyl semimetal is not topologically robust to the presence of disorder, but the surface chiral velocity is.", "date": "2018-06-15", "date_type": "published", "publication": "Physical Review B", "volume": "97", "number": "23", "publisher": "American Physical Society", "pagerange": "Art. No. 235108", "id_number": "CaltechAUTHORS:20180607-103545257", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180607-103545257", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "PHY-1607611" }, { "agency": "Air Force Office for Scientific Research (AFOSR)" }, { "agency": "Laboratory for Physical Sciences" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.97.235108", "primary_object": { "basename": "1801.05438.pdf", "url": "https://authors.library.caltech.edu/records/gx2px-hbm14/files/1801.05438.pdf" }, "related_objects": [ { "basename": "PhysRevB.97.235108.pdf", "url": "https://authors.library.caltech.edu/records/gx2px-hbm14/files/PhysRevB.97.235108.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "Wilson, Justin H.; Pixley, J. H.; et el." }, { "id": "https://authors.library.caltech.edu/records/t6w35-t2v44", "eprint_id": 86829, "eprint_status": "archive", "datestamp": "2023-08-19 09:48:37", "lastmod": "2023-10-18 20:37:21", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Esin-I", "name": { "family": "Esin", "given": "Ilya" } }, { "id": "Rudner-M-S", "name": { "family": "Rudner", "given": "Mark S." }, "orcid": "0000-0002-5150-6234" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" } ] }, "title": "Quantized transport and steady states of Floquet topological insulators", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\n(Received 11 January 2018; published 6 June 2018) \n\nWe thank Vladimir Kalnizky, Barak Katzir, Gali Matsman, and Ari Turner for illuminating discussions, and David Cohen for technical support. N.L. acknowledges support from the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 639172), from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007\u20132013), under REA Grant Agreement No. 631696, and from the Israeli Center of Research Excellence (I-CORE) \"Circle of Light\" funded by the Israel Science Foundation (Grant No. 1802/12). M.R. gratefully acknowledges the support of the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 678862), and the Villum Foundation. G.R. acknowledges support from the U. S. Army Research Office under Grant No. W911NF-16-1-0361, and from the IQIM, an NSF frontier center funded in part by the Betty and Gordon Moore Foundation. We also thank the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607611 where part of the work was done.\n\nPublished - PhysRevB.97.245401.pdf
Submitted - 1710.09404.pdf
", "abstract": "Robust electronic edge or surface modes play key roles in the fascinating quantized responses exhibited by topological materials. Even in trivial materials, topological bands and edge states can be induced dynamically by a time-periodic drive. Such Floquet topological insulators (FTIs) inherently exist out of equilibrium; the extent to which they can host quantized transport, which depends on the steady-state population of their dynamically induced edge states, remains a crucial question. In this work, we obtain the steady states of two-dimensional FTIs in the presence of the natural dissipation mechanisms present in solid state systems. We give conditions under which the steady-state distribution resembles that of a topological insulator in the Floquet basis. In this state, the distribution in the Floquet edge modes exhibits a sharp feature akin to a Fermi level, while the bulk hosts a small density of excitations. We determine the regimes where topological edge-state transport persists and can be observed in FTIs.", "date": "2018-06-15", "date_type": "published", "publication": "Physical Review B", "volume": "97", "number": "24", "publisher": "American Physical Society", "pagerange": "Art. No. 245401", "id_number": "CaltechAUTHORS:20180606-094237198", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180606-094237198", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "European Research Council (ERC)", "grant_number": "639172" }, { "agency": "Marie Curie Fellowship", "grant_number": "631696" }, { "agency": "Israel Science Foundation", "grant_number": "1802/12" }, { "agency": "European Research Council (ERC)", "grant_number": "678862" }, { "agency": "Villum Foundation" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Betty and Gordon Moore Foundation" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.97.245401", "primary_object": { "basename": "1710.09404.pdf", "url": "https://authors.library.caltech.edu/records/t6w35-t2v44/files/1710.09404.pdf" }, "related_objects": [ { "basename": "PhysRevB.97.245401.pdf", "url": "https://authors.library.caltech.edu/records/t6w35-t2v44/files/PhysRevB.97.245401.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "Esin, Ilya; Rudner, Mark S.; et el." }, { "id": "https://authors.library.caltech.edu/records/8epmr-22q41", "eprint_id": 86313, "eprint_status": "archive", "datestamp": "2023-08-19 09:14:22", "lastmod": "2023-10-18 19:27:51", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bruch-A", "name": { "family": "Bruch", "given": "Anton" } }, { "id": "Kusminskiy-S-V", "name": { "family": "Kusminskiy", "given": "Silvia Viola" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Interacting adiabatic quantum motor", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\nReceived 15 December 2017; published 9 May 2018. \n\nThis work was supported in part by CRC 183 and SPP 1666 of the Deutsche Forschungsgemeinschaft. G.R. is grateful for support from the Packard Foundation, as well as from the IQIM, an NSF PFC, and to the Aspen Center for Physics, supported by NSF Grant No. PHY-1607611.\n\nPublished - PhysRevB.97.195411.pdf
Submitted - 1712.04952.pdf
", "abstract": "We present a field-theoretic treatment of an adiabatic quantum motor. We explicitly discuss a motor called the Thouless motor which is based on a Thouless pump operating in reverse. When a sliding periodic potential is considered to be the motor degree of freedom, a bias voltage applied to the electron channel sets the motor in motion. We investigate a Thouless motor whose electron channel is modeled as a Luttinger liquid. Interactions increase the gap opened by the periodic potential. For an infinite Luttinger liquid the coupling-induced friction is enhanced by electron-electron interactions. When the Luttinger liquid is ultimately coupled to Fermi liquid reservoirs, the dissipation reduces to its value for a noninteracting electron system for a constant motor velocity. Our results can also be applied to a motor based on a nanomagnet coupled to a quantum spin Hall edge.", "date": "2018-05-15", "date_type": "published", "publication": "Physical Review B", "volume": "97", "number": "19", "publisher": "American Physical Society", "pagerange": "Art. No. 195411", "id_number": "CaltechAUTHORS:20180509-110549288", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180509-110549288", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "CRC 183" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP 1666" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF", "grant_number": "PHY-1607611" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.97.195411", "primary_object": { "basename": "1712.04952.pdf", "url": "https://authors.library.caltech.edu/records/8epmr-22q41/files/1712.04952.pdf" }, "related_objects": [ { "basename": "PhysRevB.97.195411.pdf", "url": "https://authors.library.caltech.edu/records/8epmr-22q41/files/PhysRevB.97.195411.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "Bruch, Anton; Kusminskiy, Silvia Viola; et el." }, { "id": "https://authors.library.caltech.edu/records/y0jkg-81520", "eprint_id": 85878, "eprint_status": "archive", "datestamp": "2023-08-19 08:40:35", "lastmod": "2023-10-18 19:04:01", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Peng-Yang", "name": { "family": "Peng", "given": "Yang" }, "orcid": "0000-0002-8868-2928" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Topological energy conversion through the bulk or the boundary of driven systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\nReceived 26 January 2018; revised manuscript received 4 April 2018; published 16 April 2018. \n\nWe acknowledge discussions with Y. Baum, I. Martin, and F. Nathan. We acknowledge support from the IQIM, an NSF physics frontier center funded in part by the Moore Foundation. Y.P. is grateful for support from the Walter Burke Institute for Theoretical Physics at Caltech. G.R. is grateful for support from the ARO MURI Grant No. W911NF-16-1-0361 \"Quantum Materials by Design with Electromagnetic Excitation\" sponsored by the U.S. Army.\n\nPublished - PhysRevB.97.134303.pdf
Submitted - 1801.05811.pdf
", "abstract": "Combining physical and synthetic dimensions allows a controllable realization and manipulation of high-dimensional topological states. In our work, we introduce two quasiperiodically driven one-dimensional systems which enable tunable topological energy conversion between different driving sources. Using three drives, we realize a four-dimensional quantum Hall state which allows energy conversion between two of the drives within the bulk of the one-dimensional system. With only two drives, we achieve energy conversion between the two at the edge of the chain. Both effects are a manifestation of the effective axion electrodynamics in a three-dimensional time-reversal-invariant topological insulator. Furthermore, we explore the effects of disorder and commensurability of the driving frequencies, and show the phenomena are robust. We propose two experimental platforms, based on semiconductor heterostructures and ultracold atoms in optical lattices, in order to observe the topological energy conversion.", "date": "2018-04-01", "date_type": "published", "publication": "Physical Review B", "volume": "97", "number": "13", "publisher": "American Physical Society", "pagerange": "Art. No. 134303", "id_number": "CaltechAUTHORS:20180416-135742666", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180416-135742666", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontier Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevB.97.134303", "primary_object": { "basename": "1801.05811.pdf", "url": "https://authors.library.caltech.edu/records/y0jkg-81520/files/1801.05811.pdf" }, "related_objects": [ { "basename": "PhysRevB.97.134303.pdf", "url": "https://authors.library.caltech.edu/records/y0jkg-81520/files/PhysRevB.97.134303.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "Peng, Yang and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/202q5-4cv91", "eprint_id": 82074, "eprint_status": "archive", "datestamp": "2023-08-19 08:17:14", "lastmod": "2023-10-17 22:01:23", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Baum-Y", "name": { "family": "Baum", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Setting Boundaries with Memory: Generation of Topological Boundary States in Floquet-Induced Synthetic Crystals", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\nReceived 11 September 2017; published 8 March 2018. \n\nG.\u2009R. is grateful to the National Science Foundation (NSF) for funding through Grant No. DMR-1040435 and the Packard Foundation as well as the Aspen Center for Physics, funded by NSF Grant No. PHY-1607611, where part of the work was done. G.\u2009R. and Y.\u2009B. are grateful for support through the Institute for Quantum Information and Matter (IQIM), a NSF physics frontier center funded in part by the Moore Foundation.\n\nPublished - PhysRevLett.120.106402.pdf
Submitted - 1709.03507.pdf
Supplemental Material - memory_paper_PRL_resub_Supplementary.pdf
", "abstract": "When a d-dimensional quantum system is subjected to a periodic drive, it may be treated as a (d+1)-dimensional system, where the extra dimension is a synthetic one. This approach, however, affords only a limited level of control of the effective potential along the synthetic direction. In this work, we introduce a new mean for controlling the Floquet synthetic dimension. We show that arbitrary potentials, as well as edges in the synthetic dimension, could be introduced using a memory component in the system's dynamics. We demonstrate this principle by exploring topological edge states propagating normal to synthetic dimensions. Such systems may act as an optical isolator which allows the transmission of light in a directional way. Also, we suggest an experimental realization of the memory effect in spins coupled to nanofabricated Weyl semimetal surface states.", "date": "2018-03-09", "date_type": "published", "publication": "Physical Review Letters", "volume": "120", "number": "10", "publisher": "American Physical Society", "pagerange": "Art. No. 106402", "id_number": "CaltechAUTHORS:20171004-143507726", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-143507726", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-1040435" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "PHY-1607611" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.120.106402", "primary_object": { "basename": "1709.03507.pdf", "url": "https://authors.library.caltech.edu/records/202q5-4cv91/files/1709.03507.pdf" }, "related_objects": [ { "basename": "PhysRevLett.120.106402.pdf", "url": "https://authors.library.caltech.edu/records/202q5-4cv91/files/PhysRevLett.120.106402.pdf" }, { "basename": "memory_paper_PRL_resub_Supplementary.pdf", "url": "https://authors.library.caltech.edu/records/202q5-4cv91/files/memory_paper_PRL_resub_Supplementary.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "Baum, Yuval and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/7r9qj-aph20", "eprint_id": 81794, "eprint_status": "archive", "datestamp": "2023-08-19 07:23:13", "lastmod": "2023-10-17 21:37:39", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "White-C-D", "name": { "family": "White", "given": "Christopher David" } }, { "id": "Zaletel-M-P", "name": { "family": "Zaletel", "given": "Michael" } }, { "id": "Mong-Roger-S-K", "name": { "family": "Mong", "given": "Roger S. K." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Quantum dynamics of thermalizing systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\nReceived 28 September 2017; published 16 January 2018. \n\nWe acknowledge funding provided by the Institute for\nQuantum Information and Matter, an NSF Physics Frontiers\nCenter (NSF Grant PHY-1125565) with support of the\nGordon and Betty Moore Foundation (GBMF-2644). C.D.W.\nacknowledges the generous support of the National Science\nFoundation Graduate Research Fellowship under Grant No.\nDGE1144469. G.R. acknowledges the generous support of\nthe Packard Foundation, and the NSF through award DMR-\n1410435.\n\nPublished - PhysRevB.97.035127.pdf
Submitted - 1707.01506.pdf
", "abstract": "We introduce a method \"DMT\" for approximating density operators of 1D systems that, when combined with a standard framework for time evolution (TEBD), makes possible simulation of the dynamics of strongly thermalizing systems to arbitrary times. We demonstrate that the method performs well for both near-equilibrium initial states (Gibbs states with spatially varying temperatures) and far-from-equilibrium initial states, including quenches across phase transitions and pure states.", "date": "2018-01-15", "date_type": "published", "publication": "Physical Review B", "volume": "97", "number": "3", "publisher": "American Physical Society", "pagerange": "Art. No. 035127", "id_number": "CaltechAUTHORS:20170925-082950649", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170925-082950649", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF", "grant_number": "PHY-1125565" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF-2644" }, { "agency": "NSF Graduate Research Fellowship", "grant_number": "DGE-1144469" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "DMR-1410435" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.97.035127", "primary_object": { "basename": "1707.01506.pdf", "url": "https://authors.library.caltech.edu/records/7r9qj-aph20/files/1707.01506.pdf" }, "related_objects": [ { "basename": "PhysRevB.97.035127.pdf", "url": "https://authors.library.caltech.edu/records/7r9qj-aph20/files/PhysRevB.97.035127.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "White, Christopher David; Zaletel, Michael; et el." }, { "id": "https://authors.library.caltech.edu/records/6e4ky-rxt58", "eprint_id": 84590, "eprint_status": "archive", "datestamp": "2023-08-19 07:16:09", "lastmod": "2023-10-18 16:23:13", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Seetharam-K-I", "name": { "family": "Seetharam", "given": "Karthik" } }, { "id": "Titum-P", "name": { "family": "Titum", "given": "Paraj" } }, { "id": "Kolodrubetz-M", "name": { "family": "Kolodrubetz", "given": "Michael" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Absence of thermalization in finite isolated interacting Floquet systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2018 American Physical Society. \n\nReceived 8 November 2017; revised manuscript received 6 January 2018; published 29 January 2018. \n\nThe authors would like to thank J. Garrison, M. Bukov,\nA. Polkovnikov, E. van Nieuwenburg, Y. Baum, M.-F. Tu,\nand J. Moore for insightful discussions. M.K. acknowledges\nfunding from Laboratory Directed Research and Development\nfrom Berkeley Laboratory, provided by the Director, Office\nof Science, of the US Department of Energy under Contract\nNo. DEAC02-05CH11231, and from the US DOE, Office\nof Science, Basic Energy Sciences, as part of the TIMES\ninitiative. G.R. and K.S. are grateful for support from the NSF through DMR-1410435, the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, the Packard Foundation, and from the ARO MURI W911NF-16-1-0361 \"Quantum Materials by Design with Electromagnetic Excitation\" sponsored by the US Army. K.S. is additionally grateful for support from NSF Graduate Research Fellowship Program. P.T. is supported by a National Research Council postdoctoral fellowship, and acknowledges funding from ARL CDQI, NSF PFC at JQI, ARO, AFOSR, ARO MURI, and NSF QIS.\n\nPublished - PhysRevB.97.014311.pdf
Submitted - 1710.09843.pdf
", "abstract": "Conventional wisdom suggests that the long-time behavior of isolated interacting periodically driven (Floquet) systems is a featureless maximal-entropy state characterized by an infinite temperature. Efforts to thwart this uninteresting fixed point include adding sufficient disorder to realize a Floquet many-body localized phase or working in a narrow region of drive frequencies to achieve glassy nonthermal behavior at long time. Here we show that in clean systems the Floquet eigenstates can exhibit nonthermal behavior due to finite system size. We consider a one-dimensional system of spinless fermions with nearest-neighbor interactions where the interaction term is driven. Interestingly, even with no static component of the interaction, the quasienergy spectrum contains gaps and a significant fraction of the Floquet eigenstates, at all quasienergies, have nonthermal average doublon densities. We show that this nonthermal behavior arises due to emergent integrability at large interaction strength and discuss how the integrability breaks down with power-law dependence on system size.", "date": "2018-01-01", "date_type": "published", "publication": "Physical Review B", "volume": "97", "number": "1", "publisher": "American Physical Society", "pagerange": "Art. No. 014311", "id_number": "CaltechAUTHORS:20180130-143240205", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180130-143240205", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)", "grant_number": "DEAC02-05CH11231" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Army Research Office (ARO)", "grant_number": "W911NF-16-1-0361" }, { "agency": "NSF Graduate Research Fellowship" }, { "agency": "National Research Council of Canada" }, { "agency": "Army Research Laboratory" }, { "agency": "Air Force Office of Scientific Research (AFOSR)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.97.014311", "primary_object": { "basename": "1710.09843.pdf", "url": "https://authors.library.caltech.edu/records/6e4ky-rxt58/files/1710.09843.pdf" }, "related_objects": [ { "basename": "PhysRevB.97.014311.pdf", "url": "https://authors.library.caltech.edu/records/6e4ky-rxt58/files/PhysRevB.97.014311.pdf" } ], "resource_type": "article", "pub_year": "2018", "author_list": "Seetharam, Karthik; Titum, Paraj; et el." }, { "id": "https://authors.library.caltech.edu/records/wcyh5-hb048", "eprint_id": 82835, "eprint_status": "archive", "datestamp": "2023-08-19 05:57:12", "lastmod": "2023-10-17 22:43:11", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Nathan-F", "name": { "family": "Nathan", "given": "Frederik" } }, { "id": "Rudner-M-S", "name": { "family": "Rudner", "given": "Mark S." }, "orcid": "0000-0002-5150-6234" }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Berg-E", "name": { "family": "Berg", "given": "Erez" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Quantized Magnetization Density in Periodically Driven Systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2017 American Physical Society. \n\nReceived 19 November 2016; published 31 October 2017. \n\nM.\u2009R. gratefully acknowledges the Villum Foundation, the Danish National Research Foundation, and the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under Research Executive Agency (REA) Grant agreement No. PIIF-GA-2013-627838 for support. N.\u2009L. and E.\u2009B. acknowledge financial support from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant agreement No. 639172). N.\u2009L. acknowledges support from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (No. FP7/2007-2013) under REA Grant Agreement No. 631696, and from the Israeli Center of Research Excellence (I-CORE) \"Circle of Light.\" G.\u2009R. is grateful for support from the National Science Foundation (NSF) through Grant No. DMR-1410435, the Institute of Quantum Information and Matter, a National Science Foundation Frontier Center funded by the Gordon and Betty Moore Foundation, and the Packard Foundation, and further thanks the Aspen Center for Physics for their hospitality.\n\nPublished - PhysRevLett.119.186801.pdf
Submitted - 1610.03590.pdf
Supplemental Material - SupplementaryMaterial_Resub170829.pdf
", "abstract": "We study micromotion in two-dimensional periodically driven systems in which all bulk Floquet eigenstates are localized by disorder. We show that this micromotion gives rise to a quantized time-averaged orbital magnetization density in any region completely filled with fermions. The quantization of magnetization density has a topological origin, and reveals the physical nature of the new phase identified in P. Titum, E. Berg, M.\u2009S. Rudner, G. Refael, and N.\u2009H. Lindner [Phys. Rev. X 6, 021013 (2016)]. We thus establish that the topological index of this phase can be accessed directly in bulk measurements, and propose an experimental protocol to do so using interferometry in cold-atom-based realizations.", "date": "2017-11-03", "date_type": "published", "publication": "Physical Review Letters", "volume": "119", "number": "18", "publisher": "American Physical Society", "pagerange": "Art. No. 186801", "id_number": "CaltechAUTHORS:20171101-122220832", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171101-122220832", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Villum Foundation" }, { "agency": "Danish National Research Foundation" }, { "agency": "Marie Curie Fellowship", "grant_number": "PIIF-GA-2013-627838" }, { "agency": "European Research Council (ERC)", "grant_number": "639172" }, { "agency": "Marie Curie Fellowship", "grant_number": "631696" }, { "agency": "Israeli Center of Research Excellence" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.119.186801", "primary_object": { "basename": "1610.03590.pdf", "url": "https://authors.library.caltech.edu/records/wcyh5-hb048/files/1610.03590.pdf" }, "related_objects": [ { "basename": "PhysRevLett.119.186801.pdf", "url": "https://authors.library.caltech.edu/records/wcyh5-hb048/files/PhysRevLett.119.186801.pdf" }, { "basename": "SupplementaryMaterial_Resub170829.pdf", "url": "https://authors.library.caltech.edu/records/wcyh5-hb048/files/SupplementaryMaterial_Resub170829.pdf" } ], "resource_type": "article", "pub_year": "2017", "author_list": "Nathan, Frederik; Rudner, Mark S.; et el." }, { "id": "https://authors.library.caltech.edu/records/89tex-ext79", "eprint_id": 82281, "eprint_status": "archive", "datestamp": "2023-08-19 05:39:52", "lastmod": "2023-10-17 22:09:53", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Martin-I", "name": { "family": "Martin", "given": "Ivar" }, "orcid": "0000-0002-2010-6449" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Halperin-B-I", "name": { "family": "Halperin", "given": "Bertrand" }, "orcid": "0000-0002-6999-1039" } ] }, "title": "Topological frequency conversion in strongly driven quantum systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2017 Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\nReceived 25 January 2017; published 16 October 2017.\n\nThe authors would like to thank J. Sau, M. Sanchez, A. Yacobi, V. Manucharyan, M. Gullans, M. Lukin, F. Nathan, and Y. Oreg for useful discussions. I.\u2009M. acknowledges support from the Department of Energy, Office of Basic Energy Science, Materials Science and Engineering Division. G.\u2009R. acknowledges support from the National Science Foundation (NSF) through Grant No. DMR-1410435, as well as the Institute of Quantum Information and Matter, a NSF Frontier center funded in part by the Gordon and Betty Moore Foundation, and the Packard Foundation. B.\u2009H. acknowledges support from the STC Center for Integrated Quantum Materials, NSF Grant No. DMR-1231319. This research was supported in part by the National Science Foundation under Grant No. NSF PHY-1125915. We are also grateful to the Aspen Center for Physics, operating under NSF Grant No. 1066293, where part of the work was done.\n\nPublished - PhysRevX.7.041008.pdf
Submitted - 1612.02143.pdf
", "abstract": "When a physical system is subjected to a strong external multifrequency drive, its dynamics can be conveniently represented in the multidimensional Floquet lattice. The number of Floquet lattice dimensions equals the number of irrationally-related drive frequencies, and the evolution occurs in response to a built-in effective \"electric\" field, whose components are proportional to the corresponding drive frequencies. The mapping allows us to engineer and study temporal analogs of many real-space phenomena. Here, we focus on the specific example of a two-level system under a two-frequency drive that induces topologically nontrivial band structure in the 2D Floquet space. The observable consequence of such a construction is the quantized pumping of energy between the sources with frequencies \u03c9_1 and \u03c9_2. When the system is initialized into a Floquet band with the Chern number C, the pumping occurs at a rate P_(12)=\u2212P_(21)=(C/2\u03c0)\u210f\u03c9_1\u03c9_2, an exact counterpart of the transverse current in a conventional topological insulator.", "date": "2017-10-16", "date_type": "published", "publication": "Physical Review X", "volume": "7", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 041008", "id_number": "CaltechAUTHORS:20171011-110835402", "issn": "2160-3308", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171011-110835402", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "DMR-1231319" }, { "agency": "NSF", "grant_number": "PHY-1125915" }, { "agency": "NSF", "grant_number": "PHY-1066293" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevX.7.041008", "primary_object": { "basename": "1612.02143.pdf", "url": "https://authors.library.caltech.edu/records/89tex-ext79/files/1612.02143.pdf" }, "related_objects": [ { "basename": "PhysRevX.7.041008.pdf", "url": "https://authors.library.caltech.edu/records/89tex-ext79/files/PhysRevX.7.041008.pdf" } ], "resource_type": "article", "pub_year": "2017", "author_list": "Martin, Ivar; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/p3b83-x3n24", "eprint_id": 82076, "eprint_status": "archive", "datestamp": "2023-08-19 05:09:11", "lastmod": "2023-10-17 22:01:29", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Savitz-S", "name": { "family": "Savitz", "given": "Samuel" }, "orcid": "0000-0003-2112-3758" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Stable Unitary Integrators for the Numerical Implementation of Continuous Unitary Transformations", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2017 American Physical Society.\n\nReceived 31 July 2017; published 18 September 2017.\n\nThis work was supported by the Institute of Quantum Information and Matter, a National Science Foundation frontier center partially funded by the Gordon and Betty Moore Foundation. G.R. acknowledges the generous support of the Packard Foundation and the National Science Foundation through award DMR-1410435. Thanks to E. van Nieuwenburg, S. Kehrein, M. Bintz, C. White, A. Bourzutschky, and P. Titum for many fruitful discussions. The numerical CUT flows were implemented using double-precision floating-point matrices calculated by the open-source linear algebra library armadillo [62]. Special thanks to C. Peng for GPU-accelerating the flows in Sec. V using the open-source linear algebra library arrayfire [63] and thereby helping to test their performance.\n\nPublished - PhysRevB.96.115129.pdf
Submitted - 1707.03407.pdf
", "abstract": "The technique of continuous unitary transformations has recently been used to provide physical insight into a diverse array of quantum mechanical systems. However, the question of how to best numerically implement the flow equations has received little attention. The most immediately apparent approach, using standard Runge-Kutta numerical integration algorithms, suffers from both severe inefficiency due to stiffness and the loss of unitarity. After reviewing the formalism of continuous unitary transformations and Wegner's original choice for the infinitesimal generator of the flow, we present a number of approaches to resolving these issues including a choice of generator which induces what we call the \"uniform tangent decay flow\" and three numerical integrators specifically designed to perform continuous unitary transformations efficiently while preserving the unitarity of flow. We conclude by applying one of the flow algorithms to a simple calculation that visually demonstrates the many-body localization transition.", "date": "2017-09-15", "date_type": "published", "publication": "Physical Review B", "volume": "96", "number": "11", "publisher": "American Physical Society", "pagerange": "Art. No. 115129", "id_number": "CaltechAUTHORS:20171004-144154017", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20171004-144154017", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "DMR-1410435" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.96.115129", "primary_object": { "basename": "1707.03407.pdf", "url": "https://authors.library.caltech.edu/records/p3b83-x3n24/files/1707.03407.pdf" }, "related_objects": [ { "basename": "PhysRevB.96.115129.pdf", "url": "https://authors.library.caltech.edu/records/p3b83-x3n24/files/PhysRevB.96.115129.pdf" } ], "resource_type": "article", "pub_year": "2017", "author_list": "Savitz, Samuel and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/w40ht-ny583", "eprint_id": 80545, "eprint_status": "archive", "datestamp": "2023-08-19 04:42:16", "lastmod": "2023-10-17 16:05:29", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Clark-B-K", "name": { "family": "Clark", "given": "Bryan K." } }, { "id": "Oganesyan-V", "name": { "family": "Oganesyan", "given": "Vadim" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Fixed Points of Wegner-Wilson Flows and Many-Body Localization", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2017 American Physical Society. \n\nReceived 25 August 2016; published 16 August 2017. \n\nWe are grateful to A. Scardicchio, S. Kehrein, E. Kapit, A. Chandran, D. Huse, V. Khemani, B. Altshuler, L. Rademaker, M. Ortu\u00f1o, and X. Yu for stimulating discussions. D.\u2009P. acknowledges support from the Charles E. Kaufman foundation. B.\u2009K.\u2009C. was supported by the SciDAC program of the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award No. DE-FG02-12ER46875. G.\u2009R. is grateful for support from the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, and the Packard foundation. V.\u2009O. acknowledges support from the NSF DMR Grants Nos. 0955714 and 1508538. Parts of this work were performed at the Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1066293 (D.\u2009P., B.\u2009K.\u2009C., G.\u2009R., and V.\u2009O.), ICTP Trieste (V.\u2009O.), and KITP Santa Barbara, which is supported by National Science Foundation under Grant No. NSF PHY11-25915 (D.P, G.\u2009R., and V.\u2009O.). The authors thank all three centers for the hospitality offered to us. This research is part of the Blue Waters sustained petascale computing project, which is supported by the National Science Foundation (Awards OCI-0725070 and ACI-1238993) and the State of Illinois. Blue Waters is a joint effort of the University of Illinois at Urbana Champaign and its National Center for Supercomputing Applications.\n\nPublished - PhysRevLett.119.075701.pdf
Submitted - 1607.07884.pdf
Supplemental Material - supplement-fixed-points.pdf
", "abstract": "Many-body localization (MBL) is a phase of matter that is characterized by the absence of thermalization. Dynamical generation of a large number of local quantum numbers has been identified as one key characteristic of this phase, quite possibly the microscopic mechanism of breakdown of thermalization and the phase transition itself. We formulate a robust algorithm, based on Wegner-Wilson flow (WWF) renormalization, for computing these conserved quantities and their interactions. We present evidence for the existence of distinct fixed point distributions of the latter: a Gaussian white-noise-like distribution in the ergodic phase, a 1/f law inside the MBL phase, and scale-free distributions in the transition regime.", "date": "2017-08-18", "date_type": "published", "publication": "Physical Review Letters", "volume": "119", "number": "7", "publisher": "American Physical Society", "pagerange": "Art. No. 075701", "id_number": "CaltechAUTHORS:20170817-073043882", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170817-073043882", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Charles E. Kaufman Foundation" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-FG02-12ER46875" }, { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "DMR-0955714" }, { "agency": "NSF", "grant_number": "DMR-1508538" }, { "agency": "NSF", "grant_number": "PHY-1066293" }, { "agency": "NSF", "grant_number": "PHY11-25915" }, { "agency": "NSF", "grant_number": "OCI-0725070" }, { "agency": "NSF", "grant_number": "ACI-1238993" }, { "agency": "State of Illinois" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.119.075701", "primary_object": { "basename": "1607.07884.pdf", "url": "https://authors.library.caltech.edu/records/w40ht-ny583/files/1607.07884.pdf" }, "related_objects": [ { "basename": "PhysRevLett.119.075701.pdf", "url": "https://authors.library.caltech.edu/records/w40ht-ny583/files/PhysRevLett.119.075701.pdf" }, { "basename": "supplement-fixed-points.pdf", "url": "https://authors.library.caltech.edu/records/w40ht-ny583/files/supplement-fixed-points.pdf" } ], "resource_type": "article", "pub_year": "2017", "author_list": "Pekker, David; Clark, Bryan K.; et el." }, { "id": "https://authors.library.caltech.edu/records/0g9ar-w4v18", "eprint_id": 78323, "eprint_status": "archive", "datestamp": "2023-08-19 04:33:07", "lastmod": "2023-10-26 00:00:37", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Titum-P", "name": { "family": "Titum", "given": "Paraj" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Disorder induced transitions in resonantly driven Floquet Topological Insulators", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2017 American Physical Society. \n\nReceived 21 March 2017; published 16 August 2017. \n\nP.T., N.H.L., and G.R. acknowledge support from the U.S.-Israel Bi-National Science Foundation (BSF). G.R. and P.T. are grateful for support from NSF through DMR-1410435. G.R. would like to acknowledge Aspen Center for Physics for hospitality under NSF grant 1066293. N.H.L. acknowledges support from I-Core, the Israeli excellence center Circle of Light, from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA Grant Agreement No. 631696, and from the European Research Council (ERC) under the European Union Horizon 2020 research and innovation programme, under Grant Agreement No. 639172. P.T. was also was supported by the AFOSR, ARO MURI, ARL CDQI, NSF QIS, ARO, and NSF PFC at JQI.\n\nPublished - PhysRevB.96.054207.pdf
Submitted - 1702.02956.pdf
", "abstract": "We investigate the effects of disorder in Floquet topological insulators (FTIs) occurring in semiconductor quantum wells. Such FTIs are induced by resonantly driving a transition between the valence and conduction bands. We show that when disorder is added, the topological nature of such FTIs persists as long as there is a mobility gap at the resonant quasienergy. For strong enough disorder, this gap closes and all the states become localized as the system undergoes a transition to a trivial insulator. Interestingly, the effects of disorder are not necessarily adverse: we show that in the same quantum well, disorder can also induce a transition from a trivial to a topological system, thereby establishing a Floquet topological Anderson insulator (FTAI). We identify the conditions on the driving field necessary for observing such a transition.", "date": "2017-08-01", "date_type": "published", "publication": "Physical Review B", "volume": "96", "number": "5", "publisher": "American Physical Society", "pagerange": "Art. No. 054207", "id_number": "CaltechAUTHORS:20170619-091103005", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170619-091103005", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "NSF", "grant_number": "PHY-1066293" }, { "agency": "I-CORE Program of the Planning and Budgeting Committee" }, { "agency": "Israeli Excellence Center Circle of Light" }, { "agency": "Marie Curie Fellowship", "grant_number": "631696" }, { "agency": "European Research Council (ERC)", "grant_number": "639172" }, { "agency": "Air Force Office of Scientific Research (AFOSR)" }, { "agency": "Army Research Office (ARO)" }, { "agency": "Army Research Laboratory (ARL)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.96.054207", "primary_object": { "basename": "1702.02956.pdf", "url": "https://authors.library.caltech.edu/records/0g9ar-w4v18/files/1702.02956.pdf" }, "related_objects": [ { "basename": "PhysRevB.96.054207.pdf", "url": "https://authors.library.caltech.edu/records/0g9ar-w4v18/files/PhysRevB.96.054207.pdf" } ], "resource_type": "article", "pub_year": "2017", "author_list": "Titum, Paraj; Lindner, Netanel H.; et el." }, { "id": "https://authors.library.caltech.edu/records/62wrm-8p222", "eprint_id": 79200, "eprint_status": "archive", "datestamp": "2023-08-19 04:02:29", "lastmod": "2023-10-26 14:41:10", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bairey-E", "name": { "family": "Bairey", "given": "Eyal" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" } ] }, "title": "Driving induced many-body localization", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2017 American Physical Society. \n\nReceived 13 March 2017; revised manuscript received 15 May 2017; published 19 July 2017. \n\nWe thank Dima Abanin, Jens Bardarson, Iliya Esin, Vladimir Kalnizky, Ilia Khait, Achilleas Lazarides, Roderich Moessner, and Alon Nahshony for illuminating discussions. E.B. acknowledges financial support from the Gutwirth Foundation. G.R. is grateful for support from the NSF through Grant No. DMR-1410435, the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, and the Packard Foundation. N.L. acknowledges support from the People Programme (Marie Curie Actions) of the European Union Seventh Framework Programme (No. FP7/2007\u20132013) under REA Grant Agreement No. 631696, from the Israeli Center of Research Excellence (I-CORE) \"Circle of Light,\" and from the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 639172).\n\nPublished - PhysRevB.96.020201.pdf
Submitted - 1702.06208.pdf
Supplemental Material - Driving-induced_MBL_supplementary.pdf
", "abstract": "Subjecting a many-body localized system to a time-periodic drive generically leads to delocalization and a transition to ergodic behavior if the drive is sufficiently strong or of sufficiently low frequency. Here we show that a specific drive can have an opposite effect, taking a static delocalized system into the many-body localized phase. We demonstrate this effect using a one-dimensional system of interacting hard-core bosons subject to an oscillating linear potential. The system is weakly disordered, and is ergodic absent the driving. The time-periodic linear potential leads to a suppression of the effective static hopping amplitude, increasing the relative strengths of disorder and interactions. Using numerical simulations, we find a transition into the many-body localized phase above a critical driving frequency and in a range of driving amplitudes. Our findings highlight the potential of driving schemes exploiting the coherent destruction of tunneling for engineering long-lived Floquet phases.", "date": "2017-07-01", "date_type": "published", "publication": "Physical Review B", "volume": "96", "number": "2", "publisher": "American Physical Society", "pagerange": "Art. No. 020201", "id_number": "CaltechAUTHORS:20170719-094811145", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170719-094811145", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Gutwirth Foundation" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Marie Curie Fellowship", "grant_number": "631696" }, { "agency": "I-CORE Program of the Planning and Budgeting Committee" }, { "agency": "European Research Council (ERC)", "grant_number": "639172" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.96.020201", "primary_object": { "basename": "1702.06208.pdf", "url": "https://authors.library.caltech.edu/records/62wrm-8p222/files/1702.06208.pdf" }, "related_objects": [ { "basename": "Driving-induced_MBL_supplementary.pdf", "url": "https://authors.library.caltech.edu/records/62wrm-8p222/files/Driving-induced_MBL_supplementary.pdf" }, { "basename": "PhysRevB.96.020201.pdf", "url": "https://authors.library.caltech.edu/records/62wrm-8p222/files/PhysRevB.96.020201.pdf" } ], "resource_type": "article", "pub_year": "2017", "author_list": "Bairey, Eyal; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/c9kdn-2g503", "eprint_id": 78322, "eprint_status": "archive", "datestamp": "2023-08-19 04:01:57", "lastmod": "2023-10-26 00:00:34", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Babadi-M", "name": { "family": "Babadi", "given": "Mehrtash" } }, { "id": "Knap-M", "name": { "family": "Knap", "given": "Michael" } }, { "id": "Martin-I", "name": { "family": "Martin", "given": "Ivar" }, "orcid": "0000-0002-2010-6449" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Demler-E", "name": { "family": "Demler", "given": "Eugene" } } ] }, "title": "The theory of parametrically amplified electron-phonon superconductivity", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2017 American Physical Society. \n\nReceived 11 April 2017; published 19 July 2017. \n\nWe thank A. Cavalleri, A. Georges, V. Galitski, C. Kollath, A. Millis, B. Halperin, and D. Huse for useful discussions. M.B. and G.R. are grateful for support from the NSF through Grant No. DMR-1410435, the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, and the Packard Foundation. M.K. acknowledges support from the Technical University of Munich-Institute for Advanced Study, funded by the German Excellence Initiative and the European Union FP7 under Grant Agreement No. 291763, and from the DFG Grant No. KN 1254/1-1. I.M. acknowledges support from the Materials Sciences and Engineering Division, Basic Energy Sciences, Office of Science, US Department of Energy. E.D. acknowledges support from Packard Foundation, Harvard-MIT CUA, NSF (an NSF physics frontiers center) Grant No. DMR-1308435, AFOSR Quantum Simulation MURI, and AFOSR Photonic Quantum Matter MURI.\n\nPublished - PhysRevB.96.014512.pdf
Submitted - 1702.02531.pdf
", "abstract": "Ultrafast optical manipulation of ordered phases in strongly correlated materials is a topic of significant theoretical, experimental, and technological interest. Inspired by a recent experiment on light-induced superconductivity in fullerenes [M. Mitrano et al., Nature (London) 530, 461 (2016)], we develop a comprehensive theory of light-induced superconductivity in driven electron-phonon systems with lattice nonlinearities. In analogy with the operation of parametric amplifiers, we show how the interplay between the external drive and lattice nonlinearities lead to significantly enhanced effective electron-phonon couplings. We provide a detailed and unbiased study of the nonequilibrium dynamics of the driven system using the real-time Green's function technique. To this end, we develop a Floquet generalization of the Migdal-Eliashberg theory and derive a numerically tractable set of quantum Floquet-Boltzmann kinetic equations for the coupled electron-phonon system. We study the role of parametric phonon generation and electronic heating in destroying the transient superconducting state. Finally, we predict the transient formation of electronic Floquet bands in time- and angle-resolved photoemission spectroscopy experiments as a consequence of the proposed mechanism.", "date": "2017-07-01", "date_type": "published", "publication": "Physical Review B", "volume": "96", "number": "1", "publisher": "American Physical Society", "pagerange": "Art. No. 014512", "id_number": "CaltechAUTHORS:20170619-085401037", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170619-085401037", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-1308435" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Technical University of Munich" }, { "agency": "European Research Council (ERC)", "grant_number": "291763" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "KN 1254/1-1" }, { "agency": "Department of Energy (DOE)" }, { "agency": "Harvard-MIT Center for Ultracold Atoms" }, { "agency": "Air Force Office of Scientific Research (AFOSR)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.96.014512", "primary_object": { "basename": "1702.02531.pdf", "url": "https://authors.library.caltech.edu/records/c9kdn-2g503/files/1702.02531.pdf" }, "related_objects": [ { "basename": "PhysRevB.96.014512.pdf", "url": "https://authors.library.caltech.edu/records/c9kdn-2g503/files/PhysRevB.96.014512.pdf" } ], "resource_type": "article", "pub_year": "2017", "author_list": "Babadi, Mehrtash; Knap, Michael; et el." }, { "id": "https://authors.library.caltech.edu/records/j4sad-b2d22", "eprint_id": 73558, "eprint_status": "archive", "datestamp": "2023-08-19 01:05:55", "lastmod": "2023-10-24 15:27:53", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Chan-Ching-Kit", "name": { "family": "Chan", "given": "Ching-Kit" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Lee-P-A", "name": { "family": "Lee", "given": "Patrick A." } } ] }, "title": "Photocurrents in Weyl semimetals", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2017 American Physical Society. \n\nReceived 13 August 2016; revised manuscript received 16 November 2016; published 13 January 2017. \n\nWe thank Nuh Gedik for very helpful discussions. P.A.L. acknowledges the support from DOE Grant No. DE-FG02-03-ER46076 and the Simons Fellows Program. G.R. acknowledges the supported from NSF through DMR-1410435. N.H.L. acknowledges supports from I-Core, the Israeli excellence center Circle of Light, the People Programme (Marie Curie Actions) of the European Union's Seventh Framework under REA Grant Agreement No. 631696 and financial support from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant Agreement No. 639172). P.A.L. and C.-K.C. thank the hospitality of the CMT group at Caltech where this work was carried out. G.R. thanks the Aspen Center for Physics where a part of the work was done.\n\nPublished - PhysRevB.95.041104.pdf
Submitted - 1607.07839v2.pdf
Supplemental Material - Weyl_photocurrent_supplement.pdf
", "abstract": "The generation of photocurrent in an ideal two-dimensional Dirac spectrum is symmetry forbidden. In sharp contrast, we show that three-dimensional Weyl semimetals can generically support significant photocurrents due to the combination of inversion symmetry breaking and finite tilts of the Weyl spectra. Symmetry properties, chirality relations, and various dependencies of this photovoltaic effect on the system and the light source are explored in detail. Our results suggest that noncentrosymmetric Weyl materials can be advantageously applied to room temperature detections of mid- and far-infrared radiations.", "date": "2017-01-15", "date_type": "published", "publication": "Physical Review B", "volume": "95", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 041104", "id_number": "CaltechAUTHORS:20170119-140307907", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20170119-140307907", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)", "grant_number": "DE-FG02-03-ER46076" }, { "agency": "Simons Foundation" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "I-CORE Program of the Planning and Budgeting Committee" }, { "agency": "Israeli Excellence Center Circle of Light" }, { "agency": "Marie Curie Fellowship", "grant_number": "631696" }, { "agency": "European Research Council (ERC)", "grant_number": "639172" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.95.041104", "primary_object": { "basename": "Weyl_photocurrent_supplement.pdf", "url": "https://authors.library.caltech.edu/records/j4sad-b2d22/files/Weyl_photocurrent_supplement.pdf" }, "related_objects": [ { "basename": "1607.07839v2.pdf", "url": "https://authors.library.caltech.edu/records/j4sad-b2d22/files/1607.07839v2.pdf" }, { "basename": "PhysRevB.95.041104.pdf", "url": "https://authors.library.caltech.edu/records/j4sad-b2d22/files/PhysRevB.95.041104.pdf" } ], "resource_type": "article", "pub_year": "2017", "author_list": "Chan, Ching-Kit; Lindner, Netanel H.; et el." }, { "id": "https://authors.library.caltech.edu/records/ybbsj-50g20", "eprint_id": 66831, "eprint_status": "archive", "datestamp": "2023-08-19 00:33:09", "lastmod": "2023-10-18 18:54:00", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hou-Chang-Yu", "name": { "family": "Hou", "given": "Chang-Yu" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Shtengel-K", "name": { "family": "Shtengel", "given": "Kirill" } } ] }, "title": "Quantum information sharing between topologically distinct platforms", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2016 American Physical Society. \n\nReceived 23 March 2016; revised manuscript received 12 September 2016; published 5 December 2016. \n\nThe authors would like to thank D. Clarke and N. Lindner for helpful discussions. C.Y.H. and K.S. were supported in part by the DARPA-QuEST program. K.S. was supported in part by NSF Grant No. DMR-1411359. C.Y.H. and G.R. acknowledge the support from the Packard foundation and NSF Grant No. DMR-1410435. The authors are also grateful to the IQIM, an NSF center supported in part by the Moore foundation. In addition G.R. would like to acknowledge the hospitality of the Aspen Center for Physics where part of the work was done.\n\nPublished - PhysRevB.94.235113.pdf
Submitted - 1512.03486v1.pdf
", "abstract": "Can topological quantum entanglement between anyons in one topological medium \"stray\" into a different, topologically distinct medium? In other words, can quantum information encoded nonlocally in the combined state of non-Abelian anyons be shared between two distinct topological media? For one-dimensional topological superconductors with Majorana bound states at the end of system, the quantum information store in those Majorana bound states can be transfered by directly coupling nearby Majorana bound states. However, coupling of two one-dimensional Majorana states will produce a gap, indicating that distinct topological regions of one-dimensional wires unite into a single topological region through the information transfer process. In this paper, we consider a setup with two two-dimensional p -wave superconductors of opposite chirality adjacent to each other. Even two comoving chiral modes at the domain wall between them cannot be gapped through interactions; we demonstrate that information encoded in the fermionic parity of two Majorana zero modes, originally within the same superconducting domain, can be shared between the domains or moved entirely from one domain to another provided that vortices can tunnel between them in a controlled fashion.", "date": "2016-12-15", "date_type": "published", "publication": "Physical Review B", "volume": "94", "number": "23", "publisher": "American Physical Society", "pagerange": "Art. No. 235113", "id_number": "CaltechAUTHORS:20160510-083323766", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160510-083323766", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "NSF", "grant_number": "DMR-1411359" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.94.235113", "primary_object": { "basename": "PhysRevB.94.235113.pdf", "url": "https://authors.library.caltech.edu/records/ybbsj-50g20/files/PhysRevB.94.235113.pdf" }, "related_objects": [ { "basename": "1512.03486v1.pdf", "url": "https://authors.library.caltech.edu/records/ybbsj-50g20/files/1512.03486v1.pdf" } ], "resource_type": "article", "pub_year": "2016", "author_list": "Hou, Chang-Yu; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/p4sed-rd839", "eprint_id": 69025, "eprint_status": "archive", "datestamp": "2023-08-19 00:27:41", "lastmod": "2023-10-20 16:26:45", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Wilson-J-H", "name": { "family": "Wilson", "given": "Justin H." }, "orcid": "0000-0001-6903-0417" }, { "id": "Song-Justin-C-W", "name": { "family": "Song", "given": "Justin C. W." }, "orcid": "0000-0002-5175-6970" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Remnant Geometric Hall Response in a Quantum Quench", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2016 American Physical Society. \n\nReceived 29 March 2016; published 30 November 2016. \n\nWe thank Mehrtash Babadi, Eugene Demler, and Ian Spielman for helpful discussions. We thank the Air Force Office for Scientific Research (J.\u2009W.) and the Burke fellowship at the Walter Burke Institute of Theoretical Physics, Caltech (J.\u2009C.\u2009W.\u2009S.) for support. G.\u2009R. is grateful for support through the Institute of Quantum Information and Matter (IQIM), an National Science Foundation frontier center, supported by the Gordon and Betty Moore Foundation as well as the Packard Foundation and for the hospitality of the Aspen Center for Physics, where part of the work was performed.\n\nPublished - PhysRevLett.117.235302.pdf
Submitted - 1603.01621v1.pdf
Supplemental Material - supplement2.pdf
", "abstract": "Out-of-equilibrium systems can host phenomena that transcend the usual restrictions of equilibrium systems. Here we unveil how out-of-equilibrium states, prepared via a quantum quench, can exhibit a non-zero Hall-type response that persists at long times, and even when the instantaneous Hamiltonian is time reversal symmetric; both these features starkly contrast with equilibrium Hall currents. Interestingly, the persistent Hall effect arises from processes beyond those captured by linear response, and is a signature of the novel dynamics in out-of-equilibrium systems. We propose quenches in two-band Dirac systems as natural venues to realize persistent Hall currents, which exist when either mirror or time-reversal symmetry are broken (before or after the quench). Its long time persistence, as well as sensitivity to symmetry breaking, allow it to be used as a sensitive diagnostic of the complex out-equilibrium dynamics readily controlled and probed in cold-atomic optical lattice experiments.", "date": "2016-12-02", "date_type": "published", "publication": "Physical Review Letters", "volume": "117", "number": "23", "publisher": "American Physical Society", "pagerange": "Art. No. 235302", "id_number": "CaltechAUTHORS:20160714-082247839", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160714-082247839", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Air Force Office of Scientific Research (AFOSR)" }, { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevLett.117.235302", "primary_object": { "basename": "1603.01621v1.pdf", "url": "https://authors.library.caltech.edu/records/p4sed-rd839/files/1603.01621v1.pdf" }, "related_objects": [ { "basename": "PhysRevLett.117.235302.pdf", "url": "https://authors.library.caltech.edu/records/p4sed-rd839/files/PhysRevLett.117.235302.pdf" }, { "basename": "supplement2.pdf", "url": "https://authors.library.caltech.edu/records/p4sed-rd839/files/supplement2.pdf" } ], "resource_type": "article", "pub_year": "2016", "author_list": "Wilson, Justin H.; Song, Justin C. W.; et el." }, { "id": "https://authors.library.caltech.edu/records/g2r52-3sr57", "eprint_id": 72677, "eprint_status": "archive", "datestamp": "2023-08-19 00:26:12", "lastmod": "2023-10-23 22:50:27", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Knap-M", "name": { "family": "Knap", "given": "Michael" } }, { "id": "Babadi-M", "name": { "family": "Babadi", "given": "Mehrtash" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Martin-I", "name": { "family": "Martin", "given": "Ivar" }, "orcid": "0000-0002-2010-6449" }, { "id": "Demler-E", "name": { "family": "Demler", "given": "Eugene" } } ] }, "title": "Dynamical Cooper pairing in nonequilibrium electron-phonon systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2016 American Physical Society. \n\nReceived 20 July 2016; revised manuscript received 10 October 2016; published 8 December 2016. \n\nWe thank E. Berg, A. Cavalleri, I. Cirac, U. Eckern, D. Fausti, A. Georges, S. Gopalakrishnan, B. I. Halperin, A. Imamoglu, S. Kaiser, C. Kollath, M. Norman, and T. Shi for useful discussions. We acknowledge support from the Technical University of Munich\u2014Institute for Advanced Study, funded by the German Excellence Initiative and the European Union FP7 under Grant No. 291763, Deutsche Forschungsgemeinschaft Grant No. KN 1254/1-1, Harvard-MIT CUA, NSF Grants No. DMR-1308435 and No. DMR-1410435, AFOSR Quantum Simulation MURI, the ARO-MURI on Atomtronics, Humboldt foundation, Dr. Max R\u00f6ssler, the Walter Haefner Foundation, the ETH Foundation, the Simons foundation, as well as the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation. This work was supported by the US Department of Energy, Office of Science, Materials Sciences and Engineering Division.\n\nPublished - PhysRevB.94.214504.pdf
Submitted - 1511.07874v2.pdf
", "abstract": "We analyze Cooper pairing instabilities in strongly driven electron-phonon systems. The light-induced nonequilibrium state of phonons results in a simultaneous increase of the superconducting coupling constant and the electron scattering. We demonstrate that the competition between these effects leads to an enhanced superconducting transition temperature in a broad range of parameters. Our results may explain the observed transient enhancement of superconductivity in several classes of materials upon irradiation with high intensity pulses of terahertz light, and may pave new ways for engineering high-temperature light-induced superconducting states.", "date": "2016-12-01", "date_type": "published", "publication": "Physical Review B", "volume": "94", "number": "21", "publisher": "American Physical Society", "pagerange": "Art. No. 214504", "id_number": "CaltechAUTHORS:20161208-153127646", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20161208-153127646", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "German Excellence Initiative" }, { "agency": "European Research Council (ERC)", "grant_number": "291763" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "KN 1254/1-1" }, { "agency": "Harvard-MIT Center for Ultracold Atoms" }, { "agency": "NSF", "grant_number": "DMR-1308435" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Air Force Office of Scientific Research (AFOSR)" }, { "agency": "Army Research Office (ARO)" }, { "agency": "Alexander von Humboldt Foundation" }, { "agency": "Dr. Max R\u00f6ssler" }, { "agency": "Walter Haefner Foundation" }, { "agency": "ETH Foundation" }, { "agency": "Simons Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Department of Energy (DOE)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.94.214504", "primary_object": { "basename": "1511.07874v2.pdf", "url": "https://authors.library.caltech.edu/records/g2r52-3sr57/files/1511.07874v2.pdf" }, "related_objects": [ { "basename": "PhysRevB.94.214504.pdf", "url": "https://authors.library.caltech.edu/records/g2r52-3sr57/files/PhysRevB.94.214504.pdf" } ], "resource_type": "article", "pub_year": "2016", "author_list": "Knap, Michael; Babadi, Mehrtash; et el." }, { "id": "https://authors.library.caltech.edu/records/xmyk5-8he93", "eprint_id": 70640, "eprint_status": "archive", "datestamp": "2023-08-20 13:43:15", "lastmod": "2023-10-20 23:17:23", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Quito-V-L", "name": { "family": "Quito", "given": "Victor L." } }, { "id": "Titum-P", "name": { "family": "Titum", "given": "Paraj" } }, { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Localization transition in one dimension using Wegner flow equations", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2016 American Physical Society. \n\nReceived 17 June 2016; revised manuscript received 31 August 2016; published 19 September 2016. \n\nThe authors would like to acknowledge useful discussions with S. Kehrein, S. Gopalakrishnan, E. Miranda, and D. Huse. P.T. and G.R. are grateful for support from NSF through Grant No. DMR-1410435, as well as the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, and the Packard Foundation. V.L.Q. acknowledges financial support from FAPESP, through Grants No. 2012/17082-7 and No. 2009/17531-3.\n\nPublished - PhysRevB.94.104202.pdf
", "abstract": "The flow-equation method was proposed by Wegner as a technique for studying interacting systems in one dimension. Here, we apply this method to a disordered one-dimensional model with power-law decaying hoppings. This model presents a transition as function of the decaying exponent \u03b1. We derive the flow equations and the evolution of single-particle operators. The flow equation reveals the delocalized nature of the states for \u03b1<12. Additionally, in the regime \u03b1>12, we present a strong-bond renormalization group structure based on iterating the three-site clusters, where we solve the flow equations perturbatively. This renormalization group approach allows us to probe the critical point (\u03b1=1). This method correctly reproduces the critical level-spacing statistics and the fractal dimensionality of the eigenfunctions.", "date": "2016-09-01", "date_type": "published", "publication": "Physical Review B", "volume": "94", "number": "10", "publisher": "American Physical Society", "pagerange": "Art. No. 104202", "id_number": "CaltechAUTHORS:20160928-115939815", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160928-115939815", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Funda\u00e7\u00e3o de Amparo \u00e0 Pesquisa do Estado de S\u00e3o Paulo (FAPESP)", "grant_number": "2012/17082-7" }, { "agency": "Funda\u00e7\u00e3o de Amparo \u00e0 Pesquisa do Estado de S\u00e3o Paulo (FAPESP)", "grant_number": "2009/17531-3" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.94.104202", "primary_object": { "basename": "PhysRevB.94.104202.pdf", "url": "https://authors.library.caltech.edu/records/xmyk5-8he93/files/PhysRevB.94.104202.pdf" }, "resource_type": "article", "pub_year": "2016", "author_list": "Quito, Victor L.; Titum, Paraj; et el." }, { "id": "https://authors.library.caltech.edu/records/y46xm-qw110", "eprint_id": 69567, "eprint_status": "archive", "datestamp": "2023-08-20 13:24:34", "lastmod": "2023-10-20 20:12:21", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Keser-A-C", "name": { "family": "Keser", "given": "Aydin Cem" } }, { "id": "Ganeshan-S", "name": { "family": "Ganeshan", "given": "Sriram" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Galitski-V", "name": { "family": "Galitski", "given": "Victor" } } ] }, "title": "Dynamical many-body localization in an integrable model", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2016 American Physical Society. \n\nReceived 30 June 2015; revised manuscript received 18 July 2016; published 11 August 2016. \n\nThis work was supported by US-ARO, Australian Research Council, and Simons Foundation (A.C.K. and V.G.). S.G. gratefully acknowledges support by NSF-JQI-PFC and LPS-MPO-CMTC. G.R. is grateful for support from the IQIM and the Moore Foundation and the NSF under Grant No. DMR-1410435. The authors are grateful to Sankar Das Sarma and Efim Rozenbaum for useful discussions.\n\nPublished - PhysRevB.94.085120.pdf
Submitted - 1506.05455v2.pdf
", "abstract": "We investigate dynamical many-body localization and delocalization in an integrable system of periodically-kicked, interacting linear rotors. The linear-in-momentum Hamiltonian makes the Floquet evolution operator analytically tractable for arbitrary interactions. One of the hallmarks of this model is that depending on certain parameters, it manifests both localization and delocalization in momentum space. We present a set of \"emergent\" integrals of motion, which can serve as a fundamental diagnostic of dynamical localization in the interacting case. We also propose an experimental scheme, involving voltage-biased Josephson junctions, to realize such many-body kicked models.", "date": "2016-08-15", "date_type": "published", "publication": "Physical Review B", "volume": "94", "number": "8", "publisher": "American Physical Society", "pagerange": "Art. No. 085120", "id_number": "CaltechAUTHORS:20160811-105244924", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160811-105244924", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Army Research Office (ARO)" }, { "agency": "Australian Research Council" }, { "agency": "Simons Foundation" }, { "agency": "Joint Quantum Institute (JQI)" }, { "agency": "LPS-MPO-CMTC" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "NSF Physics Frontiers Center" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.94.085120", "primary_object": { "basename": "1506.05455v2.pdf", "url": "https://authors.library.caltech.edu/records/y46xm-qw110/files/1506.05455v2.pdf" }, "related_objects": [ { "basename": "PhysRevB.94.085120.pdf", "url": "https://authors.library.caltech.edu/records/y46xm-qw110/files/PhysRevB.94.085120.pdf" } ], "resource_type": "article", "pub_year": "2016", "author_list": "Keser, Aydin Cem; Ganeshan, Sriram; et el." }, { "id": "https://authors.library.caltech.edu/records/4xs1d-mj985", "eprint_id": 67559, "eprint_status": "archive", "datestamp": "2023-08-20 13:03:44", "lastmod": "2023-10-18 21:17:30", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Freedman-M-H", "name": { "family": "Freedman", "given": "Michael H." } } ] }, "title": "Universal Geometric Path to a Robust Majorana Magic Gate", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2016 Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\nReceived 16 December 2015; published 8 August 2016. \n\nWe would like to thank useful discussions with Jason Alicea, Netanel Lindner, Alexei Kitaev, Ady Stern, Kirill Shtengel, John Preskill, Parsa Bonderson, Roman Lutchyn, and Felix von Oppen. The work at Weizmann was supported by the BSF, Israel Science Foundation (ISF), Minerva, and an ERC Grant (FP7/2007\u20132013) 340210. G.\u2009R. and T.\u2009K. are grateful for support through the Institute of Quantum Information and Matter (IQIM), a NSF frontier center, supported by the Gordon and Betty Moore Foundation. G.\u2009R. and Y.\u2009O. are grateful for the hospitality of the Aspen Center for Physics, where part of the work was performed.\n\nPublished - PhysRevX.6.031019.pdf
Submitted - 1511.05161v2.pdf
", "abstract": "A universal quantum computer requires a full set of basic quantum gates. With Majorana bound states one can form all necessary quantum gates in a topologically protected way, bar one. In this paper, we present a scheme that achieves the missing, so-called, \u03c0/8 magic phase gate without the need of fine-tuning for distinct physical realizations. The scheme is based on the manipulation of geometric phases described by a universal protocol and converges exponentially with the number of steps in the geometric path. Furthermore, our magic gate proposal relies on the most basic hardware previously suggested for topologically protected gates, and can be extended to an any-phase gate, where \u03c0/8 is substituted by any \u03b1.", "date": "2016-08", "date_type": "published", "publication": "Physical Review X", "volume": "6", "number": "3", "publisher": "American Physical Society", "pagerange": "Art. No. 031019", "id_number": "CaltechAUTHORS:20160602-064512689", "issn": "2160-3308", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160602-064512689", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "Israel Science Foundation" }, { "agency": "Minerva" }, { "agency": "European Research Council (ERC)", "grant_number": "340210" }, { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevX.6.031019", "primary_object": { "basename": "1511.05161v2.pdf", "url": "https://authors.library.caltech.edu/records/4xs1d-mj985/files/1511.05161v2.pdf" }, "related_objects": [ { "basename": "PhysRevX.6.031019.pdf", "url": "https://authors.library.caltech.edu/records/4xs1d-mj985/files/PhysRevX.6.031019.pdf" } ], "resource_type": "article", "pub_year": "2016", "author_list": "Karzig, Torsten; Oreg, Yuval; et el." }, { "id": "https://authors.library.caltech.edu/records/vk3ms-jsb05", "eprint_id": 59854, "eprint_status": "archive", "datestamp": "2023-08-20 11:02:19", "lastmod": "2023-10-23 22:46:50", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Titum-P", "name": { "family": "Titum", "given": "Paraj" } }, { "id": "Berg-E", "name": { "family": "Berg", "given": "Erez" } }, { "id": "Rudner-M-S", "name": { "family": "Rudner", "given": "Mark S." }, "orcid": "0000-0002-5150-6234" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" } ] }, "title": "Anomalous Floquet-Anderson Insulator as a Nonadiabatic Quantized Charge Pump", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2016 The Author(s). Published by the American Physical Society. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\n(Received 5 August 2015; published 6 May 2016). \n\nWe are grateful to Cosma Fulga, Mykola Maksimenko, and Ady Stern for enlightening discussions. P.\u2009T. and N.\u2009H.\u2009L. acknowledge support from the U.S.-Israel Bi-National Science foundation. N.\u2009H.\u2009L. acknowledges support from I-Core, the Israeli excellence center Circle of Light and from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA Grant Agreement No. 631696. N.\u2009H.\u2009L. and E.\u2009B. acknowledge financial support from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (Grant agreement No. 639172). E.\u2009B. was supported by the Minerva foundation, the CIG Marie Curie grant, and the Israel Science foundation. M.\u2009S.\u2009R. acknowledges support from the Villum Foundation and from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA Grant Agreement No. PIIF-GA-2013-627838. G.\u2009R. and P.\u2009T. are grateful for support from NSF through DMR-1410435, as well as the Institute of Quantum Information and Matter, a NSF Frontier center funded by the Gordon and Betty Moore Foundation, and the Packard Foundation.\n\nPublished - PhysRevX.6.021013.pdf
Submitted - 1506.00650v1.pdf
", "abstract": "We show that two-dimensional periodically driven quantum systems with spatial disorder admit a unique topological phase, which we call the anomalous Floquet-Anderson insulator (AFAI). The AFAI is characterized by a quasienergy spectrum featuring chiral edge modes coexisting with a fully localized bulk. Such a spectrum is impossible for a time-independent, local Hamiltonian. These unique characteristics of the AFAI give rise to a new topologically protected nonequilibrium transport phenomenon: quantized, yet nonadiabatic, charge pumping. We identify the topological invariants that distinguish the AFAI from a trivial, fully localized phase, and show that the two phases are separated by a phase transition.", "date": "2016-04", "date_type": "published", "publication": "Physical Review X", "volume": "6", "number": "2", "publisher": "American Physical Society", "pagerange": "Art. No. 021013", "id_number": "CaltechAUTHORS:20150824-133019180", "issn": "2160-3308", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150824-133019180", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "I-CORE Program of the Planning and Budgeting Committee" }, { "agency": "Marie Curie Fellowship", "grant_number": "631696" }, { "agency": "European Research Council (ERC)", "grant_number": "639172" }, { "agency": "Minerva Foundation" }, { "agency": "Israel Science Foundation" }, { "agency": "Villum Foundation" }, { "agency": "Marie Curie Fellowship", "grant_number": "PIIF-GA-2013-627838" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevX.6.021013", "primary_object": { "basename": "PhysRevX.6.021013.pdf", "url": "https://authors.library.caltech.edu/records/vk3ms-jsb05/files/PhysRevX.6.021013.pdf" }, "related_objects": [ { "basename": "1506.00650v1.pdf", "url": "https://authors.library.caltech.edu/records/vk3ms-jsb05/files/1506.00650v1.pdf" } ], "resource_type": "article", "pub_year": "2016", "author_list": "Titum, Paraj; Berg, Erez; et el." }, { "id": "https://authors.library.caltech.edu/records/h8wn7-tpj59", "eprint_id": 67357, "eprint_status": "archive", "datestamp": "2023-08-20 11:06:50", "lastmod": "2023-10-18 21:07:04", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Janot-A", "name": { "family": "Janot", "given": "Alexander" } }, { "id": "Rosenow-B", "name": { "family": "Rosenow", "given": "Bernd" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Topological polaritons in a quantum spin Hall cavity", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2016 American Physical Society. \n\nReceived 18 February 2015; revised manuscript received 30 September 2015; published 19 April 2016. \n\nWe thank T. Karzig and H.-G. Zirnstein for discussions. A.J. is supported by the Leipzig School of Natural Sciences BuildMoNa. B.R. would like to acknowledge DFG Grants No. RO 2247/7-1 and No. RO 2247/8-1, and G.R. acknowledges NSF Grant No. DMR 1410435, as well as the Institute of Quantum Information and Matter, an NSF center supported by the Gordon and Betty Moore Foundation.\n\nPublished - PhysRevB.93.161111.pdf
Submitted - 1501.04092v2.pdf
Supplemental Material - SM_QSHC.pdf
", "abstract": "We study the topological structure of matter-light excitations, so-called polaritons, in a quantum spin Hall insulator coupled to photonic cavity modes. We identify a topological invariant in the presence of time reversal (TR) symmetry, and demonstrate the existence of a TR-invariant topological phase. We find protected helical edge states with energies below the lower polariton branch and characteristic uncoupled excitonic states, both detectable by optical techniques. Applying a Zeeman field allows us to relate the topological index to the double coverage of the Bloch sphere by the polaritonic pseudospin.", "date": "2016-04", "date_type": "published", "publication": "Physical Review B", "volume": "93", "number": "16", "publisher": "American Physical Society", "pagerange": "Art. No. 161111", "id_number": "CaltechAUTHORS:20160525-140247002", "issn": "2469-9950", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160525-140247002", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Leipzig School of Natural Sciences BuildMoNa" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "RO 2247/7-1" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "RO 2247/8-1" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.93.161111", "primary_object": { "basename": "1501.04092v2.pdf", "url": "https://authors.library.caltech.edu/records/h8wn7-tpj59/files/1501.04092v2.pdf" }, "related_objects": [ { "basename": "PhysRevB.93.161111.pdf", "url": "https://authors.library.caltech.edu/records/h8wn7-tpj59/files/PhysRevB.93.161111.pdf" }, { "basename": "SM_QSHC.pdf", "url": "https://authors.library.caltech.edu/records/h8wn7-tpj59/files/SM_QSHC.pdf" } ], "resource_type": "article", "pub_year": "2016", "author_list": "Janot, Alexander; Rosenow, Bernd; et el." }, { "id": "https://authors.library.caltech.edu/records/hswq2-ff384", "eprint_id": 57013, "eprint_status": "archive", "datestamp": "2023-08-20 09:49:23", "lastmod": "2023-10-23 16:57:23", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bardyn-C-E", "name": { "family": "Bardyn", "given": "Charles-Edouard" } }, { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Liew-T-C-H", "name": { "family": "Liew", "given": "Tomothy C. H." } } ] }, "title": "Chiral Bogoliubov excitations in nonlinear bosonic systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2016 American Physical Society. \n\nReceived 6 April 2015; revised manuscript received 29 September 2015; published 5 January 2016. \n\nT.L. thanks Y. Chong and B. Zhang for encouraging discussions. This work was funded by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with the support of the Gordon and Betty Moore Foundation (Grant No. GBMF1250). G.R. acknowledges support from NSF Grant No. DMR-1410435. Financial support from the Swiss National Science Foundation (SNSF) is also gratefully acknowledged.\n\nPublished - PhysRevB.93.020502.pdf
Submitted - 1503.08824v1.pdf
Supplemental Material - supp_mat.pdf
Supplemental Material - svideo.mpg
", "abstract": "We present a versatile scheme for creating topological Bogoliubov excitations in weakly interacting bosonic systems. Our proposal relies on a background stationary field that consists of a Kagome vortex lattice, which breaks time-reversal symmetry and induces a periodic potential for Bogoliubov excitations. In analogy to the Haldane model, no external magnetic field or net flux is required. We construct a generic model based on the two-dimensional (2D) nonlinear Schr\u00f6dinger equation and demonstrate the emergence of topological gaps crossed by chiral Bogoliubov edge modes. Our scheme can be realized in a wide variety of physical systems ranging from nonlinear optical systems to exciton-polariton condensates.", "date": "2016-01-01", "date_type": "published", "publication": "Physical Review B", "volume": "93", "number": "2", "publisher": "American Physical Society", "pagerange": "Art. No. 020502", "id_number": "CaltechAUTHORS:20150427-125004319", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150427-125004319", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF1250" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Swiss National Science Foundation (SNSF)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.93.020502", "primary_object": { "basename": "1503.08824v1.pdf", "url": "https://authors.library.caltech.edu/records/hswq2-ff384/files/1503.08824v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.93.020502.pdf", "url": "https://authors.library.caltech.edu/records/hswq2-ff384/files/PhysRevB.93.020502.pdf" }, { "basename": "supp_mat.pdf", "url": "https://authors.library.caltech.edu/records/hswq2-ff384/files/supp_mat.pdf" }, { "basename": "svideo.mpg", "url": "https://authors.library.caltech.edu/records/hswq2-ff384/files/svideo.mpg" } ], "resource_type": "article", "pub_year": "2016", "author_list": "Bardyn, Charles-Edouard; Karzig, Torsten; et el." }, { "id": "https://authors.library.caltech.edu/records/nz7de-ndy45", "eprint_id": 63842, "eprint_status": "archive", "datestamp": "2023-08-20 09:32:46", "lastmod": "2023-10-17 17:13:15", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Seetharam-K-I", "name": { "family": "Seetharam", "given": "Karthik I." } }, { "id": "Bardyn-C-E", "name": { "family": "Bardyn", "given": "Charles-Edouard" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Rudner-M-S", "name": { "family": "Rudner", "given": "Mark S." }, "orcid": "0000-0002-5150-6234" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Controlled Population of Floquet-Bloch States via Coupling to Bose and Fermi Baths", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2015 Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\nReceived 26 February 2015; published 28 December 2015. \n\nThe authors would like to thank A. \u0130mamo\u011flu, C. Grenier, A. Srivastava, and L.\u2009I. Glazman for insightful discussions. Financial support from the Swiss National Science Foundation (SNSF) is gratefully acknowledged. M.\u2009S.\u2009R. acknowledges support from the Villum Foundation and from the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA Grant Agreement No. PIIF-GA-2013-627838. N.\u2009H.\u2009L. acknowledges support from the Israel-U.S. Binational Science Foundation and I-Core, the Israeli Excellence Center \"Circle of Light,\" and the People Programme (Marie Curie Actions) of the European Union's Seventh Framework Programme (FP7/2007-2013) under REA Grant Agreement No. 631696. G.\u2009R. and K.\u2009I.\u2009S. are grateful for support from the NSF through Grant No. DMR-1410435, as well as the Institute of Quantum Information and Matter, an NSF Frontier center funded by the Gordon and Betty Moore Foundation, and the Packard Foundation. K.\u2009I.\u2009S. is grateful for support from the NSF Graduate Research Fellowship Program.\n\nPublished - PhysRevX.5.041050.pdf
Submitted - 1502.02664v1.pdf
", "abstract": "External driving is emerging as a promising tool for exploring new phases in quantum systems. The intrinsically nonequilibrium states that result, however, are challenging to describe and control. We study the steady states of a periodically driven one-dimensional electronic system, including the effects of radiative recombination, electron-phonon interactions, and the coupling to an external fermionic reservoir. Using a kinetic equation for the populations of the Floquet eigenstates, we show that the steady-state distribution can be controlled using the momentum and energy relaxation pathways provided by the coupling to phonon and Fermi reservoirs. In order to utilize the latter, we propose to couple the system and reservoir via an energy filter which suppresses photon-assisted tunneling. Importantly, coupling to these reservoirs yields a steady state resembling a band insulator in the Floquet basis. The system exhibits incompressible behavior, while hosting a small density of excitations. We discuss transport signatures and describe the regimes where insulating behavior is obtained. Our results give promise for realizing Floquet topological insulators.", "date": "2015-12-28", "date_type": "published", "publication": "Physical Review X", "volume": "5", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 041050", "id_number": "CaltechAUTHORS:20160121-131612700", "issn": "2160-3308", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20160121-131612700", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Swiss National Science Foundation (SNSF)" }, { "agency": "Villum Foundation" }, { "agency": "European Union People Programme (Marie Curie)", "grant_number": "PIIF-GA-2013-627838" }, { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "I-CORE Program of the Planning and Budgeting Committee" }, { "agency": "Israeli Excellence Center" }, { "agency": "European Union Seventh Framework Programme (FP7/2007-2013)", "grant_number": "631696" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF Graduate Research Fellowship" } ] }, "collection": "CaltechAUTHORS", "local_group": { "items": [ { "id": "IQIM", "value": "Institute for Quantum Information and Matter" } ] }, "doi": "10.1103/PhysRevX.5.041050", "primary_object": { "basename": "1502.02664v1.pdf", "url": "https://authors.library.caltech.edu/records/nz7de-ndy45/files/1502.02664v1.pdf" }, "related_objects": [ { "basename": "PhysRevX.5.041050.pdf", "url": "https://authors.library.caltech.edu/records/nz7de-ndy45/files/PhysRevX.5.041050.pdf" } ], "resource_type": "article", "pub_year": "2015", "author_list": "Seetharam, Karthik I.; Bardyn, Charles-Edouard; et el." }, { "id": "https://authors.library.caltech.edu/records/69qv1-8qf24", "eprint_id": 61294, "eprint_status": "archive", "datestamp": "2023-08-20 08:59:02", "lastmod": "2023-10-25 14:42:43", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Song-J-C-W", "name": { "family": "Song", "given": "Justin C. W." }, "orcid": "0000-0002-5175-6970" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Lee-P-A", "name": { "family": "Lee", "given": "Patrick A." } } ] }, "title": "Linear magnetoresistance in metals: Guiding center diffusion in a smooth random potential", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2015 American Physical Society. \n\nReceived 30 July 2015; published 16 November 2015. \n\nWe thank Adam Nahum and Brian Skinner for helpful discussions. J.C.W.S. acknowledges support from a Burke fellowship at Caltech. G.R. acknowledges support from the Packard Foundation and the Institute for Quantum Information and Matter (IQIM) an NSF funded physics frontier center, supported in part by the Moore Foundation. P.A.L. acknowledges the support of the DOE under Grant No. DE-FG01-03-ER46076 and the hospitality of the IQIM while this work was initiated.\n\nPublished - PhysRevB.92.180204.pdf
Submitted - 1507.04730v1.pdf
", "abstract": "We predict that guiding center (GC) diffusion yields a linear and nonsaturating (transverse) magnetoresistance in 3D metals. Our theory is semiclassical and applies in the regime where the transport time is much greater than the cyclotron period and for weak disorder potentials which are slowly varying on a length scale much greater than the cyclotron radius. Under these conditions, orbits with small momenta along magnetic field B are squeezed and dominate the transverse conductivity. When disorder potentials are stronger than the Debye frequency, linear magnetoresistance is predicted to survive up to room temperature and beyond. We argue that magnetoresistance from GC diffusion explains the recently observed giant linear magnetoresistance in 3D Dirac materials.", "date": "2015-11-01", "date_type": "published", "publication": "Physical Review B", "volume": "92", "number": "18", "publisher": "American Physical Society", "pagerange": "Art. No. 180204", "id_number": "CaltechAUTHORS:20151019-160221583", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151019-160221583", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Walter Burke Institute for Theoretical Physics, Caltech" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-FG01-03-ER46076" } ] }, "local_group": { "items": [ { "id": "IQIM" }, { "id": "Walter-Burke-Institute-for-Theoretical-Physics" } ] }, "doi": "10.1103/PhysRevB.92.180204", "primary_object": { "basename": "1507.04730v1.pdf", "url": "https://authors.library.caltech.edu/records/69qv1-8qf24/files/1507.04730v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.92.180204.pdf", "url": "https://authors.library.caltech.edu/records/69qv1-8qf24/files/PhysRevB.92.180204.pdf" } ], "resource_type": "article", "pub_year": "2015", "author_list": "Song, Justin C. W.; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/c4gyy-xcp14", "eprint_id": 59965, "eprint_status": "archive", "datestamp": "2023-08-20 07:46:16", "lastmod": "2023-10-23 23:26:49", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kim-Kun-Woo", "name": { "family": "Kim", "given": "Kun Woo" } }, { "id": "Mong-R-S-K", "name": { "family": "Mong", "given": "Roger S. K." } }, { "id": "Franz-M", "name": { "family": "Franz", "given": "Marcel" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Holographic treatment of boundary disorder in a topological insulator", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2015 American Physical Society.\n\nReceived 3 May 2015; published 6 August 2015.\n\nIt is a pleasure to acknowledge support from the Sherman-\nFairchild Foundation (R.M.), the Packard Foundation, the\nWalter Burke Institue of Theoretical Physics, as well as the\nInstitute of Quantum Information and Matter, an NSF Frontier\nCenter, with the support of the Gordon and Betty Moore\nFoundation (K.W.K., G.R.). In addition, support from NSERC\nand CIFAR is gratefully acknowledged (M.F.).\n\nPublished - PhysRevB.92.075110.pdf
Submitted - 1503.03456.pdf
", "abstract": "The effect of boundary disorder on electronic systems is particularly interesting for topological phases with surface and edge states. Using exact diagonalization, it has been demonstrated that the surface states of a three-dimensional (3D) topological insulator survive strong surface disorder, and simply get pushed to a clean part of the bulk. Here we explore a method which analytically eliminates the clean bulk and reduces a D-dimensional problem to a Hamiltonian-diagonalization problem within the (D\u22121)-dimensional disordered boundary. This dramatic reduction in complexity allows the analysis of significantly bigger systems than is possible with exact diagonalization. We use our method to analyze a 2D topological spin-Hall insulator with nonmagnetic and magnetic edge impurities, and we calculate the disorder-induced redistribution of probability density (or local density of states) in the insulating bulk, as well as the transport effects of edge impurities. The analysis reveals how the edge recovers from disorder scattering as the disorder strength increases.", "date": "2015-08-15", "date_type": "published", "publication": "Physical Review B", "volume": "92", "number": "7", "publisher": "American Physical Society", "pagerange": "Art. No. 075110", "id_number": "CaltechAUTHORS:20150828-142414208", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150828-142414208", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Sherman Fairchild Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Walter Burke Institue of Theoretical Physics" }, { "agency": "Institute of Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Natural Sciences and Engineering Research Council of Canada (NSERC)" }, { "agency": "Canadian Institute for Advanced Research (CIAR)" } ] }, "local_group": { "items": [ { "id": "Walter-Burke-Institute-for-Theoretical-Physics" }, { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.92.075110", "primary_object": { "basename": "PhysRevB.92.075110.pdf", "url": "https://authors.library.caltech.edu/records/c4gyy-xcp14/files/PhysRevB.92.075110.pdf" }, "related_objects": [ { "basename": "1503.03456.pdf", "url": "https://authors.library.caltech.edu/records/c4gyy-xcp14/files/1503.03456.pdf" } ], "resource_type": "article", "pub_year": "2015", "author_list": "Kim, Kun Woo; Mong, Roger S. K.; et el." }, { "id": "https://authors.library.caltech.edu/records/tsfef-69f61", "eprint_id": 47240, "eprint_status": "archive", "datestamp": "2023-08-20 07:11:29", "lastmod": "2023-10-26 20:25:57", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Bardyn-C-E", "name": { "family": "Bardyn", "given": "Charles-Edouard" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Topological Polaritons", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2015 American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\nReceived 25 August 2014; revised manuscript received 29 January 2015; published 1 July 2015. \n\nWe are grateful to Bernd Rosenow, Alexander Janot, and Andrei Faraon for valuable discussions. This work was funded by the Institute for Quantum Information and Matter, a NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation through Grant No. GBMF1250, NSF through No. DMR-1410435, the David and Lucile Packard Foundation, the Bi-National Science Foundation and I-Core: the Israeli Excellence Center \"Circle of Light,\" and Darpa under funding for FENA. Support from the Swiss National Science Foundation (SNSF) is also gratefully acknowledged.\n\nPublished - PhysRevX.5.031001.pdf
Submitted - 1406.4156v3.pdf
", "abstract": "The interaction between light and matter can give rise to novel topological states. This principle was recently exemplified in Floquet topological insulators, where classical light was used to induce a topological electronic band structure. Here, in contrast, we show that mixing single photons with excitons can result in new topological polaritonic states\u2014or \"topolaritons.\" Taken separately, the underlying photons and excitons are topologically trivial. Combined appropriately, however, they give rise to nontrivial polaritonic bands with chiral edge modes allowing for unidirectional polariton propagation. The main ingredient in our construction is an exciton-photon coupling with a phase that winds in momentum space. We demonstrate how this winding emerges from the finite-momentum mixing between s-type and p-type bands in the electronic system and an applied Zeeman field. We discuss the requirements for obtaining a sizable topological gap in the polariton spectrum and propose practical ways to realize topolaritons in semiconductor quantum wells and monolayer transition metal dichalcogenides.", "date": "2015-07-01", "date_type": "published", "publication": "Physical Review X", "volume": "5", "number": "3", "publisher": "American Physical Society", "pagerange": "Art. No. 031001", "id_number": "CaltechAUTHORS:20140715-152751938", "issn": "2160-3308", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140715-152751938", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF1250" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "Israeli Excellence Center I-Core Program" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Center on Functional Engineered NanoArchitectonics (FENA)" }, { "agency": "Swiss National Science Foundation (SNSF)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevX.5.031001", "primary_object": { "basename": "1406.4156v3.pdf", "url": "https://authors.library.caltech.edu/records/tsfef-69f61/files/1406.4156v3.pdf" }, "related_objects": [ { "basename": "PhysRevX.5.031001.pdf", "url": "https://authors.library.caltech.edu/records/tsfef-69f61/files/PhysRevX.5.031001.pdf" } ], "resource_type": "article", "pub_year": "2015", "author_list": "Karzig, Torsten; Bardyn, Charles-Edouard; et el." }, { "id": "https://authors.library.caltech.edu/records/hgr6w-9j153", "eprint_id": 58002, "eprint_status": "archive", "datestamp": "2023-08-20 06:17:55", "lastmod": "2023-10-23 17:59:14", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Rahmani-A", "name": { "family": "Rahmani", "given": "Armin" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Optimal control of Majorana zero modes", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2015 American Physical Society. \n\nReceived 9 January 2015; revised manuscript received 17 April 2015; published 11 May 2015. \n\nWe acknowledge valuable discussions with Chang-Yu Hou and Falko Pientka. This work was funded by the Packard Foundation and the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation through Grant No. GBMF1250 (T.K., G.R.). We also acknowledge support from the US DOE through LANL/LDRD program, NSERC, CIfAR, and Max Planck\u2013UBC Centre for Quantum Materials (A.R.) as well as the Helmholtz Virtual Institute \"New states of matter and their excitations\" and SPP1285 of the Deutsche Forschungsgemeinschaft (F.v.O.).\n\nPublished - PhysRevB.91.201404.pdf
Submitted - 1412.5603v2.pdf
", "abstract": "Braiding of Majorana zero modes provides a promising platform for quantum information processing, which is topologically protected against errors. Strictly speaking, however, the scheme relies on infinite braiding times as it utilizes the adiabatic limit. Here we show how to minimize nonadiabatic errors for finite braiding times by finding an optimal protocol for the Majorana movement. Interestingly, these protocols are characterized by sharp transitions between Majorana motion at maximal and minimal velocities. We find that these so-called bang-bang protocols can minimize the nonadiabatic transitions of the system by orders of magnitude in comparison with naive protocols.", "date": "2015-05-15", "date_type": "published", "publication": "Physical Review B", "volume": "91", "number": "20", "publisher": "American Physical Society", "pagerange": "Art. No. 201404", "id_number": "CaltechAUTHORS:20150604-124203880", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150604-124203880", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF1250" }, { "agency": "Department of Energy (DOE)" }, { "agency": "Natural Sciences and Engineering Research Council of Canada (NSERC)" }, { "agency": "Canadian Institute for Advanced Research (CIFAR)" }, { "agency": "Max Planck\u2013UBC Centre for Quantum Materials" }, { "agency": "Helmholtz Virtual Institute" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP1285" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.91.201404", "primary_object": { "basename": "1412.5603v2.pdf", "url": "https://authors.library.caltech.edu/records/hgr6w-9j153/files/1412.5603v2.pdf" }, "related_objects": [ { "basename": "PhysRevB.91.201404.pdf", "url": "https://authors.library.caltech.edu/records/hgr6w-9j153/files/PhysRevB.91.201404.pdf" } ], "resource_type": "article", "pub_year": "2015", "author_list": "Karzig, Torsten; Rahmani, Armin; et el." }, { "id": "https://authors.library.caltech.edu/records/9kstq-jt331", "eprint_id": 57177, "eprint_status": "archive", "datestamp": "2023-08-20 06:17:24", "lastmod": "2023-10-23 17:07:55", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Pientka-F", "name": { "family": "Pientka", "given": "Falko" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Shortcuts to non-Abelian braiding", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2015 American Physical Society. \n\nReceived 28 January 2015; revised manuscript received 17 April 2015; published 12 May 2015. \n\nWe acknowledge useful discussions with Piet Brouwer and Aris Alexandradinata. This work was funded by the Packard Foundation and the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation through Grant No. GBMF1250. We are also grateful for financial support by the Virtual Institute \"New states of matter and their excitations\" as well as DFG Schwerpunkte 1666 \"Topological insulator\" and 1459 \"Graphene.\"\n\nPublished - PhysRevB.91.201102.pdf
Submitted - 1501.02811v1.pdf
Supplemental Material - Shortcuts_Supplement.pdf
", "abstract": "Topological quantum information processing relies on adiabatic braiding of non-Abelian quasiparticles. Performing the braiding operations in finite time introduces transitions out of the ground-state manifold and deviations from the non-Abelian Berry phase. We show that these errors can be eliminated by suitably designed counterdiabatic correction terms in the Hamiltonian. We implement the resulting shortcuts to adiabaticity for simple protocols of non-Abelian braiding and show that the error suppression can be substantial even for approximate realizations of the counterdiabatic terms.", "date": "2015-05-15", "date_type": "published", "publication": "Physical Review B", "volume": "91", "number": "20", "publisher": "American Physical Society", "pagerange": "Art. No. 201102", "id_number": "CaltechAUTHORS:20150504-083749618", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150504-083749618", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF1250" }, { "agency": "Helmholtz Virtual Institute" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "1666" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "1459" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.91.201102", "primary_object": { "basename": "1501.02811v1.pdf", "url": "https://authors.library.caltech.edu/records/9kstq-jt331/files/1501.02811v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.91.201102.pdf", "url": "https://authors.library.caltech.edu/records/9kstq-jt331/files/PhysRevB.91.201102.pdf" }, { "basename": "Shortcuts_Supplement.pdf", "url": "https://authors.library.caltech.edu/records/9kstq-jt331/files/Shortcuts_Supplement.pdf" } ], "resource_type": "article", "pub_year": "2015", "author_list": "Karzig, Torsten; Pientka, Falko; et el." }, { "id": "https://authors.library.caltech.edu/records/me73p-t5s49", "eprint_id": 57769, "eprint_status": "archive", "datestamp": "2023-08-20 05:49:07", "lastmod": "2023-10-23 17:44:16", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bardyn-C-E", "name": { "family": "Bardyn", "given": "Charles-Edouard" } }, { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Liew-Timothy-C-H", "name": { "family": "Liew", "given": "Timothy C. H." } } ] }, "title": "Topological polaritons and excitons in garden-variety systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2015 American Physical Society. \n\nReceived 6 October 2014; revised manuscript received 8 April 2015; published 29 April 2015. \n\nThis work was funded by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation (Grant No. GBMF1250). G.R. acknowledges the Packard Foundation and NSF under DMR-1410435 for their generous support. Financial support from the Swiss National Science Foundation (SNSF) is also acknowledged.\n\nPublished - PhysRevB.91.161413.pdf
Submitted - 1409.8282v2.pdf
", "abstract": "We present a practical scheme for creating topological polaritons in garden-variety systems based, for example, on zinc-blende semiconductor quantum wells. Our proposal requires a moderate magnetic field and a potential landscape which can be implemented, e.g., via surface acoustic waves or patterning. We identify indirect excitons in double quantum wells as an appealing alternative for topological states in exciton-based systems. Topological polaritons and indirect excitons open a new frontier for topological states in solid-state systems, which can be directly probed and manipulated while offering a system with nonlinear interactions.", "date": "2015-04-15", "date_type": "published", "publication": "Physical Review B", "volume": "91", "number": "16", "publisher": "American Physical Society", "pagerange": "Art. No. 161413", "id_number": "CaltechAUTHORS:20150522-095031056", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150522-095031056", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF1250" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "DMR-1410435" }, { "agency": "Swiss National Science Foundation (SNSF)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.91.161413", "primary_object": { "basename": "1409.8282v2.pdf", "url": "https://authors.library.caltech.edu/records/me73p-t5s49/files/1409.8282v2.pdf" }, "related_objects": [ { "basename": "PhysRevB.91.161413.pdf", "url": "https://authors.library.caltech.edu/records/me73p-t5s49/files/PhysRevB.91.161413.pdf" } ], "resource_type": "article", "pub_year": "2015", "author_list": "Bardyn, Charles-Edouard; Karzig, Torsten; et el." }, { "id": "https://authors.library.caltech.edu/records/9dt1g-8q098", "eprint_id": 44577, "eprint_status": "archive", "datestamp": "2023-08-20 04:54:18", "lastmod": "2023-10-26 14:47:33", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Titum-P", "name": { "family": "Titum", "given": "Paraj" } }, { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Rechtsman-M-C", "name": { "family": "Rechtsman", "given": "Mikael C." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Disorder-induced Floquet Topological Insulators", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2015 American Physical Society.\n\nReceived 19 March 2014; published 4 February 2015.\n\nWe thank Kun W. Kim, Shu-Ping Lee, Victor Chua and S. M. Bhattacharjee for illuminating discussions. This work was funded by the Packard Foundation, and by the Institute for Quantum Information and Matter, an NSF Physics Frontiers\nCenter with support of the Gordon and Betty Moore Foundation. NL acknowledges financial support by the Bi-National Science Foundation, and by ICore: the Israeli Excellence Center \"Circle of Light\".\n\nPublished - PhysRevLett.114.056801.pdf
Submitted - 1403.0592v1.pdf
", "abstract": "We investigate the possibility of realizing a disorder-induced topological Floquet spectrum in two-dimensional periodically-driven systems. Such a state would be a dynamical realization of the topological Anderson insulator. We establish that a disorder-induced trivial-to-topological transition indeed occurs, and characterize it by computing the disorder averaged Bott index, suitably defined for the time-dependent system. The presence of edge states in the topological state is confirmed by exact numerical time-evolution of wavepackets on the edge of the system. We consider the optimal driving regime for experimentally observing the Floquet-Anderson topological insulator, and discuss its possible realization in photonic lattices.", "date": "2015-02-06", "date_type": "published", "publication": "Physical Review Letters", "volume": "114", "number": "5", "publisher": "American Physical Society", "pagerange": "Art. No. 056801", "id_number": "CaltechAUTHORS:20140401-114739350", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140401-114739350", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "ICore Israeli Excellence Center" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.114.056801", "primary_object": { "basename": "1403.0592v1.pdf", "url": "https://authors.library.caltech.edu/records/9dt1g-8q098/files/1403.0592v1.pdf" }, "related_objects": [ { "basename": "PhysRevLett.114.056801.pdf", "url": "https://authors.library.caltech.edu/records/9dt1g-8q098/files/PhysRevLett.114.056801.pdf" } ], "resource_type": "article", "pub_year": "2015", "author_list": "Titum, Paraj; Lindner, Netanel H.; et el." }, { "id": "https://authors.library.caltech.edu/records/atxtv-bme27", "eprint_id": 47248, "eprint_status": "archive", "datestamp": "2023-08-20 04:01:29", "lastmod": "2023-10-26 20:26:22", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Junck-A", "name": { "family": "Junck", "given": "Alexandra" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Current amplification and relaxation in Dirac systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2014 American Physical Society.\n\nReceived 14 January 2014; revised manuscript received 1 October 2014; published 2 December 2014.\n\nWe thank J. Eisenstein, Erik Henriksen, Justin Song,\nFeng Wang, and Andrea Young for discussions and acknowledge\nfinancial support through SPP 1666 of the Deutsche\nForschungsgemeinschaft and a Helmholtz Virtual Institute\n\"New States of Matter and Their Excitations\" (Berlin), as well\nas DARPA, the IQIM, an NSF institute supported by the Moore\nFoundation, and the Humboldt Foundation (Pasadena).\n\nPublished - PhysRevB.90.245110.pdf
Submitted - 1312.6084v1.pdf
", "abstract": "Recent experiments provide evidence for photocurrent generation in Dirac systems such as topological-insulator surface states and graphene. Within the simplest picture, the magnitude of the photocurrents is governed by the competition between photoexcitation of particle-hole pairs and current relaxation by scattering. Here, we study the relaxation of photocurrents by electron-electron (e\u2212e) collisions, which should dominate in clean systems. We compute the current relaxation rate as a function of the initial energies of the photoexcited carriers and the Fermi energy. For a positive Fermi energy, we find that collisions of a single excited electron with the Fermi sea can substantially increase the current, while for a single excited hole the current initially decreases. Together these processes partially cancel leading to a relative suppression of the relaxation of the total photocurrent carried by an electron-hole pair. We also analyze the limit of many scattering events and find that while e\u2212e collisions initially reduce the current associated with a single hole, the current eventually reverses sign and becomes as large in magnitude as in the electron case. Thus, for photoexcited electron-hole pairs, the current ultimately relaxes to zero. We discuss schemes which may allow one to probe the nontrivial current amplification physics for individual carriers in experiment.", "date": "2014-12-15", "date_type": "published", "publication": "Physical Review B", "volume": "90", "number": "24", "publisher": "American Physical Society", "pagerange": "Art. No. 245110", "id_number": "CaltechAUTHORS:20140715-163241220", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140715-163241220", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP 1666" }, { "agency": "Helmholtz Virtual Institute" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Alexander von Humboldt Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.90.245110", "primary_object": { "basename": "1312.6084v1.pdf", "url": "https://authors.library.caltech.edu/records/atxtv-bme27/files/1312.6084v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.90.245110.pdf", "url": "https://authors.library.caltech.edu/records/atxtv-bme27/files/PhysRevB.90.245110.pdf" } ], "resource_type": "article", "pub_year": "2014", "author_list": "Junck, Alexandra; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/nxdxf-15g21", "eprint_id": 45449, "eprint_status": "archive", "datestamp": "2023-09-15 04:41:07", "lastmod": "2023-10-23 21:08:33", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Altman-E", "name": { "family": "Altman", "given": "Ehud" } }, { "id": "Demler-E", "name": { "family": "Demler", "given": "Eugene" } }, { "id": "Oganesyan-V", "name": { "family": "Oganesyan", "given": "Vadim" } } ] }, "title": "Hilbert-Glass Transition: New Universality of Temperature-Tuned Many-Body Dynamical Quantum Criticality", "ispublished": "pub", "full_text_status": "public", "keywords": "Atomic and Molecular Physics; Condensed Matter Physics; Quantum Physics", "note": "\u00a9 2014 the Authors. \n\nPublished by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.\n\nReceived 20 September 2013; revised manuscript received 23 December 2013; published 31 March 2014.\n\nIt is our pleasure to thank Kedar Damle, Olexei\nMotrunich, David Huse, and Stefan Kehrein for useful\nconversations. The authors thank the KITP and the National\nScience Foundation under Grant No. NSF PHY11-25915\nfor hospitality during the conception of the paper and the\nAspen Center for Physics and the NSF Grant No. 1066293\nfor hospitality during the writing of this paper. The\ncomputations in this paper were run on the Odyssey cluster\nsupported by the FAS Science Division Research\nComputing Group at Harvard University. The authors\nacknowledge support from the Lee A. DuBridge prize\npostdoctoral fellowship (D. P.), the IQIM, an NSF center\nsupported in part by the Moore Foundation (D. P., G. R.),\nDMR-0955714 (V. O.), the Packard Foundation (G. R.),\nBSF (E. A., E. D.), ISF and the Miller Institute for Basic\nScience (E. A.), Harvard-MIT CUA, the DARPA OLE\nprogram, AFOSR MURI on Ultracold Molecules, and\nARO-MURI on Atomtronics (E. D.).\nNote added.\u2014Recently, a paper describing a method\nthat has some similarities to our RSRG-X appeared [37].\nAnother paper posted in parallel to this one explores the\nHGT from the complementary viewpoint of the time\nevolution following a quench [38].\n\nPublished - PhysRevX.4.011052.pdf
", "abstract": "We study a new class of unconventional critical phenomena that is characterized by singularities only in dynamical quantities and has no thermodynamic signatures. One example of such a transition is the recently proposed many-body localization-delocalization transition, in which transport coefficients vanish at a critical temperature with no singularities in thermodynamic observables. Describing this purely dynamical quantum criticality is technically challenging as understanding the finite-temperature dynamics necessarily requires averaging over a large number of matrix elements between many-body eigenstates. Here, we develop a real-space renormalization group method for excited states that allows us to overcome this challenge in a large class of models. We characterize a specific example: the 1 D disordered transverse-field Ising model with generic interactions. While thermodynamic phase transitions are generally forbidden in this model, using the real-space renormalization group method for excited states we find a finite-temperature dynamical transition between two localized phases. The transition is characterized by nonanalyticities in the low-frequency heat conductivity and in the long-time (dynamic) spin correlation function. The latter is a consequence of an up-down spin symmetry that results in the appearance of an Edwards-Anderson-like order parameter in one of the localized phases.", "date": "2014-03-31", "date_type": "published", "publication": "Physical Review X", "volume": "4", "number": "1", "publisher": "American Physical Society", "pagerange": "Art. No. 011052", "id_number": "CaltechAUTHORS:20140501-160826197", "issn": "2160-3308", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140501-160826197", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "KITP" }, { "agency": "NSF", "grant_number": "PHY11-25915" }, { "agency": "Aspen Center for Physics" }, { "agency": "NSF", "grant_number": "1066293" }, { "agency": "Harvard FAS Science Division Research Computing Group" }, { "agency": "Lee A. DuBridge prize postdoctoral fellowship" }, { "agency": "IQIM" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "NSF", "grant_number": "DMR-0955714" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "BSF" }, { "agency": "ISF" }, { "agency": "Miller Institute for Basic Science" }, { "agency": "Harvard-MIT CUA" }, { "agency": "DARPA OLE program" }, { "agency": "AFOSR MURI on Ultracold Molecules" }, { "agency": "ARO-MURI on Atomtronics" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevX.4.011052", "primary_object": { "basename": "PhysRevX.4.011052.pdf", "url": "https://authors.library.caltech.edu/records/nxdxf-15g21/files/PhysRevX.4.011052.pdf" }, "resource_type": "article", "pub_year": "2014", "author_list": "Pekker, David; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/sxdyw-0rc60", "eprint_id": 45006, "eprint_status": "archive", "datestamp": "2023-08-20 00:03:13", "lastmod": "2023-10-26 17:30:00", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kim-Kun-Woo", "name": { "family": "Kim", "given": "Kun Woo" } }, { "id": "Klich-I", "name": { "family": "Klich", "given": "Israel" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Nonperturbative expression for the transmission through a leaky chiral edge mode", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2014 American Physical Society.\n\nReceived 27 July 2013; revised manuscript received 12 February 2014; published 24 March 2014.\n\nIt is a pleasure to acknowledge useful discussions with Matthew Hastings and Konstantin Efetov as well as funding from the IQIM, an NSF center, supported by the Moore Foundation, and from DARPA through FENA. I.K. acknowledges financial support from NSF CAREER Award No. DMR-0956053.\n\nPublished - PhysRevB.89.104204.pdf
Submitted - 1308.0045v1.pdf
", "abstract": "Chiral edge modes of topological insulators and Hall states exhibit nontrivial behavior of conductance in the presence of impurities or additional channels. We present a simple formula for the conductance through a chiral edge mode coupled to a disordered bulk. For a given coupling matrix between the chiral mode and bulk modes, and a Green's function matrix of bulk modes in real space, the renormalized Green's function of the chiral mode is expressed in closed form as a ratio of determinants. We demonstrate the usage of the formula in two systems: (i) a 1d wire with random on-site impurity potentials for which we found that the disorder averaging is made simpler with the formula, and (ii) a quantum Hall fluid with impurities in the bulk for which the phase picked up by the chiral mode due to the scattering with the impurities can be conveniently estimated.", "date": "2014-03-24", "date_type": "published", "publication": "Physical Review B", "volume": "89", "number": "10", "publisher": "American Physical Society", "pagerange": "Art. No. 104204", "id_number": "CaltechAUTHORS:20140417-123053304", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140417-123053304", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "NSF", "grant_number": "DMR-0956053" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.89.104204", "primary_object": { "basename": "1308.0045v1.pdf", "url": "https://authors.library.caltech.edu/records/sxdyw-0rc60/files/1308.0045v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.89.104204.pdf", "url": "https://authors.library.caltech.edu/records/sxdyw-0rc60/files/PhysRevB.89.104204.pdf" } ], "resource_type": "article", "pub_year": "2014", "author_list": "Kim, Kun Woo; Klich, Israel; et el." }, { "id": "https://authors.library.caltech.edu/records/zptjs-6a812", "eprint_id": 44598, "eprint_status": "archive", "datestamp": "2023-08-19 23:32:06", "lastmod": "2023-10-26 14:48:41", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kim-K-W", "name": { "family": "Kim", "given": "Kun Woo" } }, { "id": "Pereg-Barnea-T", "name": { "family": "Pereg-Barnea", "given": "Tami" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Semiclassical approach to bound states of a pointlike impurity in a two-dimensional Dirac system", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2014 American Physical Society. Received 5 August 2013; revised manuscript received 5 January 2014; published 18 February 2014. K.W.K. and G.R. would like to acknowledge support from DARPA through FENA, as well as from the IQIM, an NSF center with the support of the Gordon and Betty Moore\nFoundation. T.P.B. would like to acknowledge support from\nNSERC and FQRNT.\n\nPublished - PhysRevB.89.085117.pdf
Submitted - 1308.0590v1.pdf
", "abstract": "The goal of this paper is to provide an intuitive and useful tool for analyzing the impurity-bound-state problem. We develop a semiclassical approach and apply it to an impurity in two-dimensional systems with parabolic or Dirac-like bands. Our method consists of reducing a higher-dimensional problem into a sum of one-dimensional ones using the two-dimensional Green's functions as a guide. We then analyze the one-dimensional effective systems in the spirit of the wave-function-matching method as in the standard one-dimensional quantum model. We demonstrate our method on two-dimensional models with parabolic and Dirac-like dispersion, with the later specifically relevant to topological insulators.", "date": "2014-02-18", "date_type": "published", "publication": "Physical Review B", "volume": "89", "number": "8", "publisher": "American Physical Society", "pagerange": "Art. No. 085117", "id_number": "CaltechAUTHORS:20140402-092139665", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140402-092139665", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "DARPA FENA" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "NSERC" }, { "agency": "FQRNT" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.89.085117", "primary_object": { "basename": "1308.0590v1.pdf", "url": "https://authors.library.caltech.edu/records/zptjs-6a812/files/1308.0590v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.89.085117.pdf", "url": "https://authors.library.caltech.edu/records/zptjs-6a812/files/PhysRevB.89.085117.pdf" } ], "resource_type": "article", "pub_year": "2014", "author_list": "Kim, Kun Woo; Pereg-Barnea, Tami; et el." }, { "id": "https://authors.library.caltech.edu/records/w0dgm-mst54", "eprint_id": 39872, "eprint_status": "archive", "datestamp": "2023-08-19 22:28:51", "lastmod": "2023-10-24 17:16:14", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Iyer-S", "name": { "family": "Iyer", "given": "Shankar" } }, { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Susceptibility at the superfluid-insulator transition for one-dimensional disordered bosons", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 American Physical Society.\nReceived 2 August 2013; published 2 December 2013.\n\nWe thank T. Vojta for sharing his numerical results with us\nat the 2012 workshop on Quantum Matter from the Nano- to\nthe Macroscale at the MPIPKS-Dresden. We also acknowledge\nT. Giamarchi and L. Pollet for helpful conversations. We\nare grateful to the MPIPKS-Dresden, the KITP, and the Aspen\nCenter for Physics for their hospitality and acknowledge\nfinancial support from the IQIM, an NSF center supported in\npart by the Moore foundation. Additionally, DP and GR are\ngrateful for financial support from the Lee A. DuBridge Fellowship and Packard foundation respectively.\n\nPublished - PhysRevB.88.220501.pdf
Submitted - 1307.7719v1.pdf
", "abstract": "A pair of recent Monte Carlo studies have reported evidence for and against a crossover from weak to strong-disorder criticality in the one-dimensional dirty boson problem. The Monte Carlo analyses rely on measurement of two observables: the effective Luttinger parameter K_(eff) and the superfluid susceptibility \u03c7. The former quantity was previously calculated analytically, using the strong-disorder renormalization group (SDRG), by Altman, Kafri, Polkovnikov, and Refael. Here, we use an extension of the SDRG framework to find a non-universal anomalous dimension \u03b7_(sd) characterizing the divergence of the susceptibility with system size: \u03c7 ~ L^(2-\u03b7_(sd)). We show that \u03b7_(sd) obeys the hyperscaling relation \u03b7_(sd) = 1/2K_(eff). We also identify an important obstacle to measuring this exponent on finite-size systems and comment on the implications for numerics and experiments.", "date": "2013-12-02", "date_type": "published", "publication": "Physical Review B", "volume": "88", "number": "22", "publisher": "American Physical Society", "pagerange": "Art. No. 220501", "id_number": "CaltechAUTHORS:20130812-104101196", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130812-104101196", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Lee A. DuBridge Fellowship" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.88.220501", "primary_object": { "basename": "1307.7719v1.pdf", "url": "https://authors.library.caltech.edu/records/w0dgm-mst54/files/1307.7719v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.88.220501.pdf", "url": "https://authors.library.caltech.edu/records/w0dgm-mst54/files/PhysRevB.88.220501.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Iyer, Shankar; Pekker, David; et el." }, { "id": "https://authors.library.caltech.edu/records/pd731-3kf37", "eprint_id": 38744, "eprint_status": "archive", "datestamp": "2023-08-19 22:19:09", "lastmod": "2023-10-23 23:25:59", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Boosting Majorana zero modes", "ispublished": "pub", "full_text_status": "public", "keywords": "Condensed Matter Physics, Superconductivity, Topological Insulators", "note": "\u00a9 2013 Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. \n\nReceived 20 May 2013; revised 13 August 2013; published 22 November 2013. \n\nIt is a pleasure to thank L. Glazman, C.-Y. Hou, and D. Pesin for helpful discussions. This work was funded by the Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation, the Packard Foundation, a Bessel award of the Alexander-von-Humboldt Foundation, SPP 1285 of the Deutsche Forschungsgemeinschaft, as well as the Helmholtz Virtual Institute \"New states of matter and their excitations.\"\n\nPublished - PhysRevX.3.041017.pdf
Submitted - 1305.3626v1.pdf
", "abstract": "One-dimensional topological superconductors are known to host Majorana zero modes at domain walls terminating the topological phase. Their non-Abelian nature allows for processing quantum information by braiding operations that are insensitive to local perturbations, making Majorana zero modes a promising platform for topological quantum computation. Motivated by the ultimate goal of executing quantum-information processing on a finite time scale, we study domain walls moving at a constant velocity. We exploit an effective Lorentz invariance of the Hamiltonian to obtain an exact solution of the associated quasiparticle spectrum and wave functions for arbitrary velocities. Essential features of the solution have a natural interpretation in terms of the familiar relativistic effects of Lorentz contraction and time dilation. We find that the Majorana zero modes remain stable as long as the domain wall moves at subluminal velocities with respect to the effective speed of light of the system. However, the Majorana bound state dissolves into a continuous quasiparticle spectrum after the domain wall propagates at luminal or even superluminal velocities. This relativistic catastrophe implies that there is an upper limit for possible braiding frequencies even in a perfectly clean system with an arbitrarily large topological gap. We also exploit our exact solution to consider domain walls moving past static impurities present in the system.", "date": "2013-12", "date_type": "published", "publication": "Physical Review X", "volume": "3", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 041017", "id_number": "CaltechAUTHORS:20130603-083248608", "issn": "2160-3308", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130603-083248608", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation", "grant_number": "GBMF1250" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Alexander von Humboldt Foundation" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP 1285" }, { "agency": "Helmholtz Virtual Institute" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevX.3.041017", "primary_object": { "basename": "1305.3626v1.pdf", "url": "https://authors.library.caltech.edu/records/pd731-3kf37/files/1305.3626v1.pdf" }, "related_objects": [ { "basename": "PhysRevX.3.041017.pdf", "url": "https://authors.library.caltech.edu/records/pd731-3kf37/files/PhysRevX.3.041017.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Karzig, Torsten; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/93mj0-3af52", "eprint_id": 42781, "eprint_status": "archive", "datestamp": "2023-08-19 22:11:33", "lastmod": "2023-10-25 23:00:57", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pientka-F", "name": { "family": "Pientka", "given": "Falko" } }, { "id": "Jiang-Liang", "name": { "family": "Jiang", "given": "Liang" }, "orcid": "0000-0002-0000-9342" }, { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Magneto-Josephson effects and Majorana bound states in quantum wires", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 Institute of Physics Ltd and Deutsche Physikalische Gesellschaft. \nContent from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.\nAny further distribution of this work must maintain attribution to the author(s) and the title of the work, journal\ncitation and DOI.\n\nReceived 29 April 2013. Published 1 November 2013. We thank Arbel Haim for discussions and are grateful for support from the Helmholtz Virtual Institute 'New states of matter and their excitations', SPP1285 (DFG), NSF grant DMR-1055522, ISF, BSF, a TAMU-WIS grant, NBRPC (973 program) grant 2011CBA00300 (2011CBA00301), the Alfred P Sloan Foundation, the Packard Foundation, the Humboldt\nFoundation, the Minerva Foundation, the Sherman Fairchild Foundation, the Lee A DuBridge Foundation, the Moore Foundation funded CEQS, the Institute for Quantum Information and Matter (IQIM), NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation, and the Studienstiftung des dt. Volkes.\n\nPublished - 1367-2630_15_11_115001.pdf
Submitted - 1304.7667v2.pdf
", "abstract": "A prominent signature of Majorana bound states is the exotic Josephson effects they produce, the classic example being a fractional Josephson current with 4\u03c0 periodicity in the phase difference across the junction. Recent work established that topological insulator edges support a novel 'magneto-Josephson effect', whereby a dissipationless current exhibits 4\u03c0-periodic dependence also on the relative orientation of the Zeeman fields in the two banks of the junction. Here, we explore the magneto-Josephson effect in junctions based on spin\u2013orbit-coupled quantum wires. In contrast to the topological insulator case, the periodicities of the magneto-Josephson effect no longer follow from an exact superconductor\u2013magnetism duality of the Hamiltonian. We employ numerical calculations as well as analytical arguments to identify the domain configurations that display exotic Josephson physics for quantum-wire junctions, and elucidate the characteristic differences with the corresponding setups for topological insulators edges. To provide guidance to experiments, we also estimate the magnitude of the magneto-Josephson effects in realistic parameter regimes, and compare the Majorana-related contribution to the coexisting 2\u03c0-periodic effects emerging from non-Majorana states.", "date": "2013-11-01", "date_type": "published", "publication": "New Journal of Physics", "volume": "15", "publisher": "IOP", "pagerange": "Art. No. 115001", "id_number": "CaltechAUTHORS:20131203-070612581", "issn": "1367-2630", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131203-070612581", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Helmholtz Virtual Institute" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP1285" }, { "agency": "NSF", "grant_number": "DMR-1055522" }, { "agency": "Israel Science Foundation" }, { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "TAMU-WIS" }, { "agency": "NBRPC 973 Program", "grant_number": "2011CBA00300" }, { "agency": "NBRPC 973 Program", "grant_number": "2011CBA00301" }, { "agency": "Alfred P. Sloan Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Alexander von Humboldt Foundation" }, { "agency": "Minerva Foundation" }, { "agency": "Sherman Fairchild Foundation" }, { "agency": "Lee A. DuBridge Foundation" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Studienstiftung des dt. deutschen Volkes" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1088/1367-2630/15/11/115001", "primary_object": { "basename": "1304.7667v2.pdf", "url": "https://authors.library.caltech.edu/records/93mj0-3af52/files/1304.7667v2.pdf" }, "related_objects": [ { "basename": "1367-2630_15_11_115001.pdf", "url": "https://authors.library.caltech.edu/records/93mj0-3af52/files/1367-2630_15_11_115001.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Pientka, Falko; Jiang, Liang; et el." }, { "id": "https://authors.library.caltech.edu/records/vaqc7-v2c62", "eprint_id": 44059, "eprint_status": "archive", "datestamp": "2023-09-22 22:28:00", "lastmod": "2023-10-23 23:22:41", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Altman-E", "name": { "family": "Altman", "given": "Ehud" } } ] }, "title": "Strong disorder renormalization group primer and the superfluid\u2013insulator transition", "ispublished": "pub", "full_text_status": "public", "keywords": "Superfluid\u2013insulator transition; Strong disorder; Renormalization group; Randomness; Bosons; Transition superfluide\u2013isolant; D\u00e9sordre fort; Groupe de renormalisation; Hasard", "note": "\u00a9 2013 Published by Elsevier Masson SAS on behalf of Acad\u00e9mie des sciences. Available online 18 October 2013. Much of the work reviewed here was carried out together with many collaborators, without whom none of it would have come to pass. We would like to especially acknowledge Daniel S. Fisher, Anatoli Polkovnikov, Yariv Kafri, Victor Gurarie, Joel Moore, John Chalker, David Pekker, Shankar Iyer, Susanne Pielawa, and Ronen Vosk. In addition, we would like to express our gratitude for the many discussions we had with Thierry Giamarchi, Pierre le Doussal, David Huse, Thomas Vojta, and Steve Girvin, Nikolay Prokof'ev, Boris Svistunov and Lode Pollet. We are grateful to the Packard Foundation, as well as to the NSF, ISF, the Minerva foundation, the Miller Institute of Science at UC Berkeley, and the Moore Foundation for support through the Caltech IQIM.\n\nSubmitted - 1402.6008v1.pdf
", "abstract": "This brief review introduces the method and application of real-space renormalization group to strongly disordered quantum systems. The focus is on recent applications of the strong disorder renormalization group to the physics of disordered-boson systems and the superfluid\u2013insulator transition in one dimension. The fact that there is also a well-understood weak disorder theory for this problem allows us to illustrate what aspects of the physics change at strong disorder. In particular, the strong disorder RG analysis suggests that the transitions at weak disorder and strong disorder belong to distinct universality classes, but this question remains under debate and is not fully resolved to date. Further applications of the strong disorder renormalization group to higher-dimensional Bose systems and to bosons coupled to dissipation are also briefly reviewed.", "date": "2013-10", "date_type": "published", "publication": "Comptes Rendus Physique", "volume": "14", "number": "8", "publisher": "Elsevier Masson SAS", "pagerange": "725-739", "id_number": "CaltechAUTHORS:20140228-102011963", "issn": "1631-0705", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140228-102011963", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Packard Foundation" }, { "agency": "NSF" }, { "agency": "ISF" }, { "agency": "Minerva Foundation" }, { "agency": "UC Berkeley Miller Institute of Science" }, { "agency": "Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1016/j.crhy.2013.09.005", "primary_object": { "basename": "1402.6008v1.pdf", "url": "https://authors.library.caltech.edu/records/vaqc7-v2c62/files/1402.6008v1.pdf" }, "resource_type": "article", "pub_year": "2013", "author_list": "Refael, Gil and Altman, Ehud" }, { "id": "https://authors.library.caltech.edu/records/qcdk4-r4y12", "eprint_id": 41657, "eprint_status": "archive", "datestamp": "2023-08-19 21:11:33", "lastmod": "2023-10-24 23:54:37", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Junck-A", "name": { "family": "Junck", "given": "Alexandra" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Photocurrent response of topological insulator surface states", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 American Physical Society.\n\nReceived 12 March 2013; published 30 August 2013.\n\nWe thank D. Hsieh for discussions and acknowledge\nfinancial support through the Helmholtz Virtual Institute \"New\nStates of Matter and Their Excitations\" (Berlin) as well as\nDARPA, the IQIM, an NSF institute supported by the Moore\nFoundation, and the Humboldt Foundation (Pasadena).\n\nPublished - PhysRevB.88.075144.pdf
Submitted - 1301.4392v1.pdf
", "abstract": "We study the photocurrent response of topological insulator surface states to circularly polarized light for arbitrary oblique incidence. We describe the surface states within a Dirac model, including several perturbations such as hexagonal warping, nonlinear corrections to the mode velocity, and applied magnetic fields. We find that the photogalvanic current is strongly suppressed for the usual orbital coupling, prompting us to include the weaker Zeeman coupling. We find that the helicity-independent photocurrent dominates over the helicity-dependent contributions.", "date": "2013-08-30", "date_type": "published", "publication": "Physical Review B", "volume": "88", "number": "7", "publisher": "American Physical Society", "pagerange": "Art. No. 075144", "id_number": "CaltechAUTHORS:20131003-112718407", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131003-112718407", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Helmholtz Virtual Institute" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Moore Foundationdon and Betty Moore Foundation" }, { "agency": "Humboldt Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.88.075144", "primary_object": { "basename": "1301.4392v1.pdf", "url": "https://authors.library.caltech.edu/records/qcdk4-r4y12/files/1301.4392v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.88.075144.pdf", "url": "https://authors.library.caltech.edu/records/qcdk4-r4y12/files/PhysRevB.88.075144.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Junck, Alexandra; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/0xz56-x2j75", "eprint_id": 42280, "eprint_status": "archive", "datestamp": "2023-08-19 21:02:23", "lastmod": "2023-10-25 15:48:25", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hou-C-Y", "name": { "family": "Hou", "given": "Chang-Yu" } }, { "id": "Shtengel-K", "name": { "family": "Shtengel", "given": "Kirill" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Thermopower and Mott formula for a Majorana edge state", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 American Physical Society. Received 6 June 2013; revised manuscript received 12 July 2013; published 7 August 2013. The authors would like to thank A. R. Akhmerov and\nD. Pekker for helpful discussions. C.Y.H. and K.S. were\nsupported in part by the DARPA-QuEST program. K.S. was\nsupported in part by NSF Award No. DMR-0748925. G.R.\nis grateful for support from the Packard Foundation and\nthe IQIM, an NSF center supported in part by the Moore\nFoundation.\n\nPublished - PhysRevB.88.075304.pdf
Submitted - 1305.5292v3.pdf
", "abstract": "We study the thermoelectric effect between a conducting lead and a Majorana edge state. In the tunneling limit, we first use the Landauer-B\u00fcttiker formalism to derive the Mott formula relating the thermopower and the differential conductance between a conducting lead and a superconductor. When the tunneling takes place between a conducting lead and a Majorana edge state, we show that a nonvanishing thermopower can exist. Combining measurements of the differential conductance and the voltage induced by the temperature difference between the conducting lead and the edge state, the Mott formula provides a unique way to infer the temperature of the Majorana edge state.", "date": "2013-08-07", "date_type": "published", "publication": "Physical Review B", "volume": "88", "number": "7", "publisher": "American Physical Society", "pagerange": "Art. No. 075304", "id_number": "CaltechAUTHORS:20131106-131944894", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20131106-131944894", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "DARPA-QuEST Program" }, { "agency": "NSF", "grant_number": "DMR-0748925" }, { "agency": "Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.88.075304", "primary_object": { "basename": "1305.5292v3.pdf", "url": "https://authors.library.caltech.edu/records/0xz56-x2j75/files/1305.5292v3.pdf" }, "related_objects": [ { "basename": "PhysRevB.88.075304.pdf", "url": "https://authors.library.caltech.edu/records/0xz56-x2j75/files/PhysRevB.88.075304.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Hou, Chang-Yu; Shtengel, Kirill; et el." }, { "id": "https://authors.library.caltech.edu/records/jj3w2-7rt60", "eprint_id": 41172, "eprint_status": "archive", "datestamp": "2023-08-19 21:01:44", "lastmod": "2023-10-24 23:30:30", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bustos-Mar\u00fan-R", "name": { "family": "Bustos-Mar\u00fan", "given": "Ra\u00fal" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Adiabatic Quantum Motors", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 American Physical Society.\n\nReceived 22 May 2013; published 5 August 2013.\n\nWe acknowledge discussions with P. Brouwer as well\nas support by the Deutsche Forschungsgemeinschaft\nthrough SFB 658, CONICET, the Humboldt Foundation,\nthe Packard Foundation, and the Institute for Quantum\nInformation and Matter, an NSF Physics Frontiers Center\nwith support of the Gordon and Betty Moore Foundation.\n\nPublished - PhysRevLett.111.060802.pdf
Submitted - 1304.4969v1.pdf
", "abstract": "When parameters are varied periodically, charge can be pumped through a mesoscopic conductor without applied bias. Here, we consider the inverse effect in which a transport current drives a periodic variation of an adiabatic degree of freedom. This provides a general operating principle for adiabatic quantum motors which we discuss here in general terms. We relate the work performed per cycle on the motor degree of freedom to characteristics of the underlying quantum pump and discuss the motors' efficiency. Quantum motors based on chaotic quantum dots operate solely due to quantum interference, and motors based on Thouless pumps have ideal efficiency.", "date": "2013-08-05", "date_type": "published", "publication": "Physical Review Letters", "volume": "111", "number": "6", "publisher": "American Physical Society", "pagerange": "Art. No. 060802", "id_number": "CaltechAUTHORS:20130909-112144198", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130909-112144198", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SFB 658" }, { "agency": "CONICET" }, { "agency": "Alexander von Humboldt Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.111.060802", "primary_object": { "basename": "1304.4969v1.pdf", "url": "https://authors.library.caltech.edu/records/jj3w2-7rt60/files/1304.4969v1.pdf" }, "related_objects": [ { "basename": "PhysRevLett.111.060802.pdf", "url": "https://authors.library.caltech.edu/records/jj3w2-7rt60/files/PhysRevLett.111.060802.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Bustos-Mar\u00fan, Ra\u00fal; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/ags4w-qfg70", "eprint_id": 31478, "eprint_status": "archive", "datestamp": "2023-08-22 09:40:18", "lastmod": "2023-10-17 16:37:01", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Bergman-D-L", "name": { "family": "Bergman", "given": "Doron L." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Galitski-V", "name": { "family": "Galitski", "given": "Victor" } } ] }, "title": "Topological Floquet Spectrum in Three Dimensions via a Two-Photon Resonance", "ispublished": "pub", "full_text_status": "public", "keywords": "Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Materials Science (cond-mat.mtrl-sci)", "note": "\u00a9 2013 American Physical Society.\n\nReceived 21 February 2012; published 24 June 2013.\n\nWe thank Joseph Avron, Erez Berg, Daniel Podolsky, John\nPreskill, and Mark Rudner for helpful discussions. V.G. was\nsupported by NSF CAREER Award No. DMR-0847224. N.L.\nwas supported by the Gordon and Betty Moore Foundation and\nNSF through Caltech's Institute of Quantum Information and\nMatter, and by the National Science Foundation under Grant\nNo. PHY-0803371. D.L.B. was supported by the Sherman\nFairchild foundation. G.R. and V.G. acknowledge support from\nDARPA. We are also grateful for the hospitality of the Aspen\nPhysics Center where part of this work was done. We also\nacknowledge hospitality of the KITP and the National Science\nFoundation for Grant No. NSF PHY05-51164.\n\nPublished - PhysRevB.87.235131.pdf
Submitted - 1111.4518v2.pdf
", "abstract": "Three dimensional (3D) topological insulators display an array of unique properties such as single Dirac-cone surface states and a strong magnetoelectric effect. Here we show how a 3D topological spectrum can be induced in a trivial insulator by a periodic drive and, in particular, using electromagnetic radiation. In contrast to the two-dimensional analog, we show that a two-photon resonance is required to transform an initially unremarkable band structure into a topological Floquet spectrum. We provide an intuitive, geometrical picture, alongside a numerical solution of a driven lattice model featuring a single surface Dirac mode. Also, we show that the polarization and frequency of the driving electromagnetic field control the details of the surface modes and particularly the Dirac mass. Specific experimental realizations of the 3D Floquet topological insulator are proposed.", "date": "2013-06-24", "date_type": "published", "publication": "Physical Review B", "volume": "87", "number": "23", "publisher": "American Physical Society", "pagerange": "Art. No. 235131", "id_number": "CaltechAUTHORS:20120515-144047298", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120515-144047298", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF CAREER", "grant_number": "DMR-0847224" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "NSF" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF", "grant_number": "PHY-0803371" }, { "agency": "Sherman Fairchild Foundation" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "NSF", "grant_number": "PHY05-51164" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.87.235131", "primary_object": { "basename": "PhysRevB.87.235131.pdf", "url": "https://authors.library.caltech.edu/records/ags4w-qfg70/files/PhysRevB.87.235131.pdf" }, "related_objects": [ { "basename": "1111.4518v2.pdf", "url": "https://authors.library.caltech.edu/records/ags4w-qfg70/files/1111.4518v2.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Lindner, Netanel H.; Bergman, Doron L.; et el." }, { "id": "https://authors.library.caltech.edu/records/z2d6m-4xt15", "eprint_id": 39573, "eprint_status": "archive", "datestamp": "2023-08-19 20:25:33", "lastmod": "2023-10-24 16:57:03", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Junck-A", "name": { "family": "Junck", "given": "Alexandra" } }, { "id": "Kim-K-W", "name": { "family": "Kim", "given": "Kun W." } }, { "id": "Bergman-D-L", "name": { "family": "Bergman", "given": "Doron L." } }, { "id": "Pereg-Barnea-T", "name": { "family": "Pereg-Barnea", "given": "T." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Transport through a disordered topological-metal strip", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 American Physical Society.\n\nReceived 15 March 2013; published 12 June 2013.\n\nWe thank F. von Oppen for helpful discussions. We would\nlike to acknowledge financial support through the Helmholtz\nVirtual Institute \"New states of matter and their excitations\"\n(A.J. and G.R.), from DARPA (K.W.K. and G.R.), of the\nSherman Fairchild Foundation (D.L.B.), and from NSERC\nand FQRNT (T.P.B.).\n\nPublished - PhysRevB.87.235114.pdf
Submitted - 1302.3014v1.pdf
", "abstract": "Features of a topological phase, and edge states in particular, may be obscured by overlapping in energy with a trivial conduction band. The topological nature of such a conductor, however, is revealed in its transport properties, especially in the presence of disorder. In this work, we explore the conductance behavior of such a system with disorder present, and contrast it with the quantized conductance in an ideal two-dimensional topological insulator. Our analysis relies on numerics on a lattice system and analytics on a simple toy model. Interestingly, we find that as disorder is increased from zero, the edge conductivity initially falls from its quantized value; yet, as disorder continues to increase, the conductivity recovers, and saturates at a value slightly below the quantized value of the clean system. We discuss how this effect can be understood from the tendency of the bulk states to localize, while the edge states remain delocalized.", "date": "2013-06-12", "date_type": "published", "publication": "Physical Review B", "volume": "87", "number": "23", "publisher": "American Physical Society", "pagerange": "Art. No. 235114", "id_number": "CaltechAUTHORS:20130725-082656877", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130725-082656877", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Helmholtz Virtual Institute" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Sherman Fairchild Foundation" }, { "agency": "NSERC" }, { "agency": "FQRNT" } ] }, "doi": "10.1103/PhysRevB.87.235114", "primary_object": { "basename": "1302.3014v1.pdf", "url": "https://authors.library.caltech.edu/records/z2d6m-4xt15/files/1302.3014v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.87.235114.pdf", "url": "https://authors.library.caltech.edu/records/z2d6m-4xt15/files/PhysRevB.87.235114.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Junck, Alexandra; Kim, Kun W.; et el." }, { "id": "https://authors.library.caltech.edu/records/b02bj-w0f61", "eprint_id": 38429, "eprint_status": "archive", "datestamp": "2023-08-19 19:30:52", "lastmod": "2023-10-23 20:09:39", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Iyer-S", "name": { "family": "Iyer", "given": "Shankar" } }, { "id": "Oganesyan-V", "name": { "family": "Oganesyan", "given": "Vadim" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Huse-D-A", "name": { "family": "Huse", "given": "David A." } } ] }, "title": "Many-body localization in a quasiperiodic system", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 American Physical Society. \n\nReceived 21 December 2012; revised 8 February 2013; published 8 April 2013. \n\nWe thank E. Altman, M. Babadi, E. Berg, S.-B. Chung, K. Damle, D. Fisher, M. Haque, Y. Lahini, A. Lazarides, M. Moeckel, J. Moore, A. Pal, S. Parameswaran, D. Pekker, S. Raghu, A. Rey, and J. Simon for helpful discussions. This research was supported, in part, by a grant of computer time from the City University of New York High Performance \nComputing Center under NSF Grants No. CNS-0855217 and No. CNS-0958379. S.I. thanks the organizers of the 2010 Boulder School for Condensed Matter and Materials Physics. S.I. and V.O. thank the organizers of the Carges\u00e8 School on Disordered Systems. S.I. and G.R. acknowledge the hospitality of the Free University of Berlin. V.O. and D.A.H are grateful to KITP (Santa Barbara), where this research was supported in part by the National Science Foundation under Grant No.NSF PHY11-25915. V.O. thanks NSF for support through Award No. DMR-0955714, and also CNRS and Institute Henri Poincar\u00e9 (Paris, France) for hospitality.D.A.H. thanks NSF for support through Award No. DMR-0819860.\n\nPublished - PhysRevB.87.134202.pdf
Submitted - 1212.4159v2.pdf
", "abstract": "Recent theoretical and numerical evidence suggests that localization can survive in disordered many-body systems with very high energy density, provided that interactions are sufficiently weak. Stronger interactions can destroy localization, leading to a so-called many-body localization transition. This dynamical phase transition is relevant to questions of thermalization in extended quantum systems far from the zero-temperature limit. It separates a many-body localized phase, in which localization prevents transport and thermalization, from a conducting (\"ergodic\") phase in which the usual assumptions of quantum statistical mechanics hold. Here, we present numerical evidence that many-body localization also occurs in models without disorder but rather a quasiperiodic potential. In one dimension, these systems already have a single-particle localization transition, and we show that this transition becomes a many-body localization transition upon the introduction of interactions. We also comment on possible relevance of our results to experimental studies of many-body dynamics of cold atoms and nonlinear light in quasiperiodic potentials.", "date": "2013-04-08", "date_type": "published", "publication": "Physical Review B", "volume": "87", "number": "13", "publisher": "American Physical Society", "pagerange": "Art. No. 134202", "id_number": "CaltechAUTHORS:20130510-141525888", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130510-141525888", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "CNS-0855217" }, { "agency": "NSF", "grant_number": "CNS-0958379" }, { "agency": "NSF", "grant_number": "PHY11-25915" }, { "agency": "NSF", "grant_number": "DMR-0955714" }, { "agency": "Centre National de la Recherche Scientifique (CNRS)" }, { "agency": "Institute Henri Poincar\u00e9" }, { "agency": "NSF", "grant_number": "DMR-0819860" } ] }, "doi": "10.1103/PhysRevB.87.134202", "primary_object": { "basename": "1212.4159v2.pdf", "url": "https://authors.library.caltech.edu/records/b02bj-w0f61/files/1212.4159v2.pdf" }, "related_objects": [ { "basename": "PhysRevB.87.134202.pdf", "url": "https://authors.library.caltech.edu/records/b02bj-w0f61/files/PhysRevB.87.134202.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Iyer, Shankar; Oganesyan, Vadim; et el." }, { "id": "https://authors.library.caltech.edu/records/z01wd-fjc41", "eprint_id": 38110, "eprint_status": "archive", "datestamp": "2023-08-19 19:07:04", "lastmod": "2023-10-23 19:49:35", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Meyer-J-S", "name": { "family": "Meyer", "given": "Julia S." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Disordered topological metals", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 American Physical Society.\nReceived 22 November 2012; published 26 March 2013.\n\nWe acknowledge helpful discussions with Victor Gurarie,\nDoron Bergman, and Matt Hastings. This work was funded\nthrough an EU-FP7 Marie Curie IRG (JM), and by DARPA\nand FENA (GR), the Humboldt foundation, and the IQIM, an\nNSF Physics Frontiers Center with support of the Gordon and\nBetty Moore Foundation. We also thank the Aspen Center for\nPhysics, where part of the work was done.\n\nPublished - PhysRevB.87.104202.pdf
", "abstract": "Topological behavior can be masked when disorder is present. A topological insulator, either intrinsic or interaction induced, may turn gapless when sufficiently disordered. Nevertheless, the metallic phase that emerges once a topological gap closes retains several topological characteristics. By considering the self-consistent disorder-averaged Green function of a topological insulator, we derive the condition for gaplessness. We show that the edge states survive in the gapless phase as edge resonances and that, similar to a doped topological insulator, the disordered topological metal also has a finite, but nonquantized topological index. We then consider the disordered Mott topological insulator. We show that within mean-field theory, the disordered Mott topological insulator admits a phase where the symmetry-breaking order parameter remains nonzero but the gap is closed, in complete analogy to \"gapless superconductivity\" due to magnetic disorder.", "date": "2013-03-26", "date_type": "published", "publication": "Physical Review B", "volume": "87", "number": "10", "publisher": "American Physical Society", "pagerange": "Art. No. 104202", "id_number": "CaltechAUTHORS:20130425-082200743", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130425-082200743", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "European Union (EU) FP7 Marie Curie IRG" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "FENA" }, { "agency": "Humboldt foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.87.104202", "primary_object": { "basename": "PhysRevB.87.104202.pdf", "url": "https://authors.library.caltech.edu/records/z01wd-fjc41/files/PhysRevB.87.104202.pdf" }, "resource_type": "article", "pub_year": "2013", "author_list": "Meyer, Julia S. and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/9g9zp-ar906", "eprint_id": 37631, "eprint_status": "archive", "datestamp": "2023-08-19 14:47:15", "lastmod": "2023-10-23 17:52:32", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Jiang-Liang", "name": { "family": "Jiang", "given": "Liang" }, "orcid": "0000-0002-0000-9342" }, { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Brataas-A", "name": { "family": "Brataas", "given": "Arne" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Magneto-Josephson effects in junctions with Majorana bound states", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 American Physical Society.\nReceived 9 July 2012; revised manuscript received 28 January 2013; published 25 February 2013.\nIt is a pleasure to thank M. P. A. Fisher, L. Glazman,\nA. Haim, B. Halperin, A. Kitaev, L. Kouwenhoven, C.\nMarcus, J. Meyer, Y. Most, F. Pientka, J. Preskill, X. L.\nQi, K. Shtengel, and A. Stern for useful discussions, and\nthe Aspen Center for Physics for hospitality. We are also\ngrateful for support from the NSF through grant DMR-1055522, BSF, SPP1285 (DFG), NBRPC (973 program) grant 2011CBA00300 (2011CBA00301), the Alfred P. Sloan Foundation,\nthe Packard Foundation, the Humboldt Foundation, the Minerva Foundation, the Sherman Fairchild Foundation, the Lee A. DuBridge Foundation, the Moore-Foundation funded\nCEQS, and the Institute for Quantum Information and Matter (IQIM) an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation.\n\nPublished - PhysRevB.87.075438.pdf
Submitted - 1206.1581v1.pdf
", "abstract": "We investigate 1D quantum systems that support Majorana bound states at interfaces between topologically distinct regions. In particular, we show that there exists a duality between particle-hole and spin degrees of freedom in certain spin-orbit-coupled 1D platforms such as topological insulator edges. This duality results in a spin analog of previously explored \"fractional Josephson effects\"\u2014that is, the spin current flowing across a magnetic junction exhibits 4\u03c0 periodicity in the relative magnetic field angle across the junction. Furthermore, the interplay between the particle-hole and spin degrees of freedom results in unconventional magneto-Josephson effects, such that the Josephson charge current is a function of the magnetic field orientation with periodicity 4\u03c0.", "date": "2013-02-25", "date_type": "published", "publication": "Physical Review B", "volume": "87", "number": "7", "publisher": "American Physical Society", "pagerange": "Art. No. 075438", "id_number": "CaltechAUTHORS:20130326-135438324", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20130326-135438324", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-1055522" }, { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP1285" }, { "agency": "NBRPC 973 Program", "grant_number": "2011CBA00300" }, { "agency": "NBRPC 973 Program", "grant_number": "2011CBA00301" }, { "agency": "Alfred P. Sloan Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Alexander von Humboldt Foundation" }, { "agency": "Minerva Foundation" }, { "agency": "Sherman Fairchild Foundation" }, { "agency": "Lee A. DuBridge Foundation" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.87.075438", "primary_object": { "basename": "1206.1581v1.pdf", "url": "https://authors.library.caltech.edu/records/9g9zp-ar906/files/1206.1581v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.87.075438.pdf", "url": "https://authors.library.caltech.edu/records/9g9zp-ar906/files/PhysRevB.87.075438.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Jiang, Liang; Pekker, David; et el." }, { "id": "https://authors.library.caltech.edu/records/3p1vv-myv71", "eprint_id": 29025, "eprint_status": "archive", "datestamp": "2023-08-19 14:19:22", "lastmod": "2023-10-24 18:18:59", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bergman-D-L", "name": { "family": "Bergman", "given": "Doron L." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Thermodynamic measure of the magnetoelectric coupling in a three-dimensional topological insulator", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2013 American Physical Society.\n\nReceived 20 July 2012; published 8 January 2013.\n\nD.L.B. was generously supported by the Sherman Fairchild\nFoundation. G.R. acknowledges support from DARPA and\nfrom the Caltech Institute of Quantum Information and Matter,\nan NSF Physics Frontiers Center with the support of the\nGordon and Betty Moore Foundation.\n\nPublished - PhysRevB.87.024202.pdf
Submitted - 1201.3042v1.pdf
", "abstract": "We show that the magnetoelectric coupling in three-dimensional (strong) topological insulators is related to a second derivative of the bulk magnetization. The formula we derive is the nonlinear-response analog of the Streda formula for Hall conductivity [Streda, J. Phys. C 15, L717 (1982)], which relates the Hall conductivity to the derivative of the magnetization with respect to the chemical potential. Our finding allows one to extract the magnetoelectric coefficient by measuring the magnetization, while varying the chemical potential and one more perturbing field. The relation we find also makes transparent the effect of disorder on the magnetoelectric response, which occurs only through the density of states, and has no effect when the system is gapped.", "date": "2013-01-08", "date_type": "published", "publication": "Physical Review B", "volume": "87", "number": "2", "publisher": "American Physical Society", "pagerange": "Art. No. 024202", "id_number": "CaltechAUTHORS:20120130-132632571", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120130-132632571", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Sherman Fairchild Foundation" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Caltech Institute of Quantum Information and Matter" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.87.024202", "primary_object": { "basename": "1201.3042v1.pdf", "url": "https://authors.library.caltech.edu/records/3p1vv-myv71/files/1201.3042v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.87.024202.pdf", "url": "https://authors.library.caltech.edu/records/3p1vv-myv71/files/PhysRevB.87.024202.pdf" } ], "resource_type": "article", "pub_year": "2013", "author_list": "Bergman, Doron L. and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/6qzsm-pyn88", "eprint_id": 30386, "eprint_status": "archive", "datestamp": "2023-08-22 07:08:32", "lastmod": "2023-10-17 15:41:27", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Berg-E", "name": { "family": "Berg", "given": "Erez" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Stern-A", "name": { "family": "Stern", "given": "Ady" }, "orcid": "0000-0002-9493-268X" } ] }, "title": "Fractionalizing Majorana fermions: non-Abelian Statistics on the Edges of Abelian Quantum Hall States", "ispublished": "pub", "full_text_status": "public", "keywords": "Condensed Matter Physics; Superconductivity; Topological\nInsulators", "note": "Published 2012 by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.\nReceived 1 May 2012; published 11 October 2012.\nN. H. L. and E. B. have contributed equally to this work.\nWe thank Maissam Barkeshli, Lukasz Fidkowsky, Bert\nHalperin, Alexei Kitaev, Chetan Nayak, and John Preskill\nfor useful discussions. E. B. was supported by the National\nScience Foundation under Grant Nos. DMR-0757145 and\nDMR-0705472. A. S. thanks the US-Israel Binational\nScience Foundation, the Minerva Foundation, and\nMicrosoft Station Q for financial support. N. H. L. and\nG. R. acknowledge funding provided by the Institute for Quantum Information and Matter, an NSF Physics\nFrontiers Center with support of the Gordon and Betty\nMoore Foundation, and DARPA. N. H. L. was also supported\nby the David and Lucile Packard Foundation. This\nwork was supported in part by the National Science\nFoundation Grant No. 1066293 and the hospitality of the\nAspen Center for Physics.\nNote added.\u2014We recently became aware that a similar\nidea is being pursued by David Clarke, Jason Alicea, and\nKirill Shtengel [65]. In addition, two papers on related\nsubjects [66,67] have appeared.\n\nPublished - PhysRevX.2.041002.pdf
Submitted - 1204.5733v1.pdf
", "abstract": "We study the non-abelian statistics characterizing systems where counterpropagating gapless modes on the edges of fractional quantum Hall states are gapped by proximity coupling to superconductors and ferromagnets. The most transparent example is that of a fractional quantum spin Hall state, in which electrons of one spin direction occupy a fractional quantum Hall state of\nv = 1/m, while electrons of the opposite spin occupy a similar state with v = -1/m. However, we also propose other examples of such systems, which are easier to realize experimentally. We find that each interface between a region on the edge coupled to a superconductor and a region coupled to a ferromagnet corresponds to a non-Abelian anyon of quantum dimension \u221a(2m). We calculate the\nunitary transformations that are associated with braiding of these anyons, and show that they are able to realize a richer set of non-Abelian representations of the braid group than the set realized by non-abelian anyons based on Majorana fermions. We carry out this calculation both explicitly and by applying general considerations. Finally, we show that topological manipulations with these\nanyons cannot realize universal quantum computation.", "date": "2012-10-11", "date_type": "published", "publication": "Physical Review X", "volume": "2", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 041002", "id_number": "CaltechAUTHORS:20120430-073146103", "issn": "2160-3308", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120430-073146103", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-0757145" }, { "agency": "NSF", "grant_number": "DMR-0705472" }, { "agency": "US-Israel Binational Science Foundation (BSF)" }, { "agency": "Minerva foundation" }, { "agency": "Microsoft Station Q" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "1066293" }, { "agency": "Aspen Center for Physics" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevX.2.041002", "primary_object": { "basename": "1204.5733v1.pdf", "url": "https://authors.library.caltech.edu/records/6qzsm-pyn88/files/1204.5733v1.pdf" }, "related_objects": [ { "basename": "PhysRevX.2.041002.pdf", "url": "https://authors.library.caltech.edu/records/6qzsm-pyn88/files/PhysRevX.2.041002.pdf" } ], "resource_type": "article", "pub_year": "2012", "author_list": "Lindner, Netanel H.; Berg, Erez; et el." }, { "id": "https://authors.library.caltech.edu/records/fmas8-8qk41", "eprint_id": 35349, "eprint_status": "archive", "datestamp": "2023-08-22 07:07:57", "lastmod": "2023-10-20 16:08:06", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hou-C-Y", "name": { "family": "Hou", "given": "C.-Y" } }, { "id": "Shtengel-K", "name": { "family": "Shtengel", "given": "K." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Goldbart-P-M", "name": { "family": "Goldbart", "given": "P. M." } } ] }, "title": "Ettingshausen effect due to Majorana modes", "ispublished": "pub", "full_text_status": "public", "keywords": "Quantum gases, liquids and solids; Superconductivity; Statistical physics and nonlinear systems", "note": "\u00a9 2012 Institute of Physics Publishing Ltd and Deutsche Physikalische Gesellschaft. \nContent from this work may be used under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.\nReceived 21 May 2012. \nPublished 3 October 2012. The authors would like to thank A R Akhmerov, F Hassler, R M Lutchyn and C Nayak for\nhelpful discussions. CYH and KS were supported in part by the DARPA-QuEST program. KS was supported in part by NSF award DMR-0748925. PMG was supported in part by NSF awards\nDMR-0906780 and DMR-1207026. KS, GR and PMG are grateful for the hospitality of the Aspen Center for Physics where this work was conceived. CYH would like to acknowledge the\nhospitality of Microsoft Station Q. GR is grateful for support from DARPA.\n\nPublished - 1367-2630_14_10_105005.pdf
Submitted - 1203.5793v1.pdf
", "abstract": "The presence of Majorana zero-energy modes at vortex cores in a topological superconductor implies that each vortex carries an extra entropy s_0, given by (k_B/2)ln\u20092, that is independent of temperature. By utilizing this special property of Majorana modes, the edges of a topological superconductor can be cooled (or heated) by the motion of the vortices across the edges. As vortices flow in the transverse direction with respect to an external imposed supercurrent, due to the Lorentz force, a thermoelectric effect analogous to the Ettingshausen effect is expected to occur between opposing edges. We propose an experiment to observe this thermoelectric effect, which could directly probe the intrinsic entropy of Majorana zero-energy modes.", "date": "2012-10-03", "date_type": "published", "publication": "New Journal of Physics", "volume": "14", "number": "10", "publisher": "IOP", "pagerange": "Art. No. 105005", "id_number": "CaltechAUTHORS:20121108-091556878", "issn": "1367-2630", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121108-091556878", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency (DARPA)-QuEST Program" }, { "agency": "NSF", "grant_number": "DMR-0748925" }, { "agency": "NSF", "grant_number": "DMR-0906780" }, { "agency": "NSF", "grant_number": "DMR-1207026" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" } ] }, "doi": "10.1088/1367-2630/14/10/105005", "primary_object": { "basename": "1203.5793v1.pdf", "url": "https://authors.library.caltech.edu/records/fmas8-8qk41/files/1203.5793v1.pdf" }, "related_objects": [ { "basename": "1367-2630_14_10_105005.pdf", "url": "https://authors.library.caltech.edu/records/fmas8-8qk41/files/1367-2630_14_10_105005.pdf" } ], "resource_type": "article", "pub_year": "2012", "author_list": "Hou, C.-Y; Shtengel, K.; et el." }, { "id": "https://authors.library.caltech.edu/records/yw3zj-jc791", "eprint_id": 35231, "eprint_status": "archive", "datestamp": "2023-08-19 12:48:17", "lastmod": "2023-10-20 15:52:37", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lee-Shu-Ping", "name": { "family": "Lee", "given": "Shu-Ping" } }, { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Electrical Manipulation of Majorana Fermions in an Interdigitated Superconductor-Ferromagnet Device", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2012 American Physical Society.\n\nReceived 4 June 2012; published 18 September 2012.\nWe are indebted to Charles M. Marcus for proposing the\ninterdigitated structure studied here, and to Julia Meyer for\ndiscussions on the Fraunhofer pattern. We also thank E.\nGrosfeld, K. T. Law, J. Eisenstein, P. T. Bhattacharjee, S.\nIyer, and D. Nandi for illuminating discussions. We are grateful to the Packard Foundation (G. R.), the Humboldt\nFoundation. and the Institute for Quantum Information and\nMatter, an NSF Physics Frontiers Center with support of\nthe Gordon and Betty Moore Foundation. J. A. gratefully\nacknowledges funding from the National Science\nFoundation through Grant No. DMR-1055522 and the\nAlfred P. Sloan Foundation.\n\nPublished - PhysRevLett.109.126403.pdf
Submitted - 1205.3185v1.pdf
", "abstract": "We show that a topological phase supporting Majorana fermions can form in a two-dimensional electron gas (2DEG) adjacent to an interdigitated superconductor-ferromagnet structure. An advantage of this setup is that the 2DEG can induce the required Zeeman splitting and superconductivity from a single interface, allowing one to utilize a wide class of 2DEGs including the surface states of bulk InAs. We demonstrate that the interdigitated device supports a robust topological phase when the finger spacing \u03bb is smaller than half of the Fermi wavelength \u03bb_F. In this regime, the electrons effectively see a \"smeared\" Zeeman splitting and pairing field despite the interdigitation. The topological phase survives even in the opposite limit \u03bb>\u03bb_F/2, although with a reduced bulk gap. We describe how to electrically generate a vortex in this setup to trap a Majorana mode, and predict an anomalous Fraunhofer pattern that provides a sharp signature of chiral Majorana edge states.", "date": "2012-09-18", "date_type": "published", "publication": "Physical Review Letters", "volume": "109", "number": "12", "publisher": "American Physical Society", "pagerange": "Art. No. 126403", "id_number": "CaltechAUTHORS:20121101-101619309", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20121101-101619309", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "David and Lucile Packard Foundation" }, { "agency": "Alexander von Humboldt Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "NSF", "grant_number": "DMR-1055522" }, { "agency": "Alfred P. Sloan Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.109.126403", "primary_object": { "basename": "1205.3185v1.pdf", "url": "https://authors.library.caltech.edu/records/yw3zj-jc791/files/1205.3185v1.pdf" }, "related_objects": [ { "basename": "PhysRevLett.109.126403.pdf", "url": "https://authors.library.caltech.edu/records/yw3zj-jc791/files/PhysRevLett.109.126403.pdf" } ], "resource_type": "article", "pub_year": "2012", "author_list": "Lee, Shu-Ping; Alicea, Jason; et el." }, { "id": "https://authors.library.caltech.edu/records/5c512-dw803", "eprint_id": 31480, "eprint_status": "archive", "datestamp": "2023-08-19 11:18:09", "lastmod": "2023-10-17 16:37:07", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Laumann-C-R", "name": { "family": "Laumann", "given": "C. R." } }, { "id": "Huse-D-A", "name": { "family": "Huse", "given": "D. A." } }, { "id": "Ludwig-A-W-W", "name": { "family": "Ludwig", "given": "A. W. W." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Trebst-S", "name": { "family": "Trebst", "given": "S." } }, { "id": "Troyer-M", "name": { "family": "Troyer", "given": "M." } } ] }, "title": "Strong-disorder renormalization for interacting non-Abelian anyon systems in two dimensions", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2012 American Physical Society.\n\nReceived 16 March 2012; published 5 June 2012.\n\nC.R.L. acknowledges support from a Lawrence Gollub\nfellowship and the NSF through a grant for the Institute\nfor Theoretical Atomic and Molecular Physics (ITAMP) at\nHarvard University. D.A.H. was supported, in part, by NSF\nGrant No. DMR-0819860. A.W.W.L. was supported, in part,\nby NSF Grant No. DMR-0706140. G.R. was supported, in\npart, by the Packard Foundation and the IQIM, and an NSF\nPFC with support of the Moore Foundation.\n\nPublished - PhysRevB.85.224201.pdf
Submitted - 1203.3752v1.pdf
", "abstract": "We consider the effect of quenched spatial disorder on systems of interacting, pinned non-Abelian anyons as might arise in disordered Hall samples at filling fractions \u03bd=5/2 or \u03bd=12/5. In one spatial dimension, such disordered anyon models have previously been shown to exhibit a hierarchy of infinite randomness phases. Here, we address systems in two spatial dimensions and report on the behavior of Ising and Fibonacci anyons under the numerical strong-disorder renormalization group (SDRG). In order to manage the topology-dependent interactions generated during the flow, we introduce a planar approximation to the SDRG treatment. We characterize this planar approximation by studying the flow of disordered hard-core bosons and the transverse field Ising model, where it successfully reproduces the known infinite randomness critical point with exponent \u03c8 \u2248 0.49. Our main conclusion for disordered anyon models in two spatial dimensions is that systems of Ising anyons as well as systems of Fibonacci anyons do not realize infinite randomness phases, but flow back to weaker disorder under the numerical SDRG treatment.", "date": "2012-06-05", "date_type": "published", "publication": "Physical Review B", "volume": "85", "number": "22", "publisher": "American Physical Society", "pagerange": "Art. No. 224201", "id_number": "CaltechAUTHORS:20120515-151935679", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120515-151935679", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Lawrence Gollub Fellowship" }, { "agency": "Harvard University" }, { "agency": "NSF", "grant_number": "DMR-0819860" }, { "agency": "NSF", "grant_number": "DMR-0706140" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "NSF Physics Frontiers Center" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.85.224201", "primary_object": { "basename": "1203.3752v1.pdf", "url": "https://authors.library.caltech.edu/records/5c512-dw803/files/1203.3752v1.pdf" }, "related_objects": [ { "basename": "PhysRevB.85.224201.pdf", "url": "https://authors.library.caltech.edu/records/5c512-dw803/files/PhysRevB.85.224201.pdf" } ], "resource_type": "article", "pub_year": "2012", "author_list": "Laumann, C. R.; Huse, D. A.; et el." }, { "id": "https://authors.library.caltech.edu/records/jzgnz-mg350", "eprint_id": 31279, "eprint_status": "archive", "datestamp": "2023-08-19 10:35:34", "lastmod": "2023-10-17 15:43:57", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Halperin-B-I", "name": { "family": "Halperin", "given": "Bertrand I." }, "orcid": "0000-0002-6999-1039" }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Stern-A", "name": { "family": "Stern", "given": "Ady" }, "orcid": "0000-0002-9493-268X" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Adiabatic manipulations of Majorana fermions in a three-dimensional network of quantum wires", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2012 American Physical Society.\n\nReceived 28 December 2011; revised manuscript received 12 March 2012; published 2 April 2012.\n\nWe thank Charles Marcus and Karsten Flensberg for helpful\ndiscussions. The work was funded by a Microsoft grant, NSF\nGrant No. DMR-0906475, NSF Grant No. DMR-0906475,\nBSF, Minerva, and SPP 1285 of the Deutsche Forschungsgemeinschaft.\nG.R. acknowledges funding provided by the\nInstitute for Quantum Information and Matter, an NSF Physics\nFrontiers Center with support of the Gordon and Betty Moore\nFoundation. We also acknowledge the hospitality of the Aspen\nCenter for Physics and the Kavli Institute for Theoretical\nPhysics (University of California, Santa Barbara).\n\nPublished - Halperin2012p17889Phys_Rev_B.pdf
", "abstract": "It has been proposed that localized zero-energy Majorana states can be realized in a two-dimensional network of quasi-one-dimensional semiconductor wires that are proximity coupled to a bulk superconductor. The wires should have strong spin-orbit coupling with appropriate symmetry, and their electrons should be partially polarized by a strong Zeeman field. Then, if the Fermi level is in an appropriate range, the wire can be in a topological superconducting phase, with Majorana states that occur at wire ends and at Y junctions, where three topological superconductor segments may be joined. Here we generalize these ideas to consider a three-dimensional network. The positions of Majorana states can be manipulated, and their non-Abelian properties made visible, by using external gates to selectively deplete portions of the network or by physically connecting and redividing wire segments. Majorana states can also be manipulated by reorientations of the Zeeman field on a wire segment, by physically rotating the wire about almost any axis, or by evolution of the phase of the order parameter in the proximity-coupled superconductor. We show how to keep track of sign changes in the zero-energy Hilbert space during adiabatic manipulations by monitoring the evolution of each Majorana state separately, rather than keeping track of the braiding of all possible pairs. This has conceptual advantages in the case of a three-dimensional network, and may be computationally useful even in two dimensions, if large numbers of Majorana sites are involved.", "date": "2012-04-02", "date_type": "published", "publication": "Physical Review B", "volume": "85", "number": "14", "publisher": "American Physical Society", "pagerange": "Art. No. 144501", "id_number": "CaltechAUTHORS:20120502-145534850", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120502-145534850", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Microsoft" }, { "agency": "NSF", "grant_number": "DMR-0906475" }, { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "MINERVA (Israel)" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP 1285" }, { "agency": "Institute for Quantum Information and Matter (IQIM)" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.85.144501", "primary_object": { "basename": "Halperin2012p17889Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/jzgnz-mg350/files/Halperin2012p17889Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2012", "author_list": "Halperin, Bertrand I.; Oreg, Yuval; et el." }, { "id": "https://authors.library.caltech.edu/records/29b51-apt52", "eprint_id": 30017, "eprint_status": "archive", "datestamp": "2023-08-19 10:17:28", "lastmod": "2023-10-17 15:14:05", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Iyer-S", "name": { "family": "Iyer", "given": "S." } }, { "id": "Pekker-D", "name": { "family": "Pekker", "given": "D." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } } ] }, "title": "Mott glass to superfluid transition for random bosons in two dimensions", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2012 American Physical Society.\n\nReceived 1 November 2011; published 14 March 2012.\nIt is our pleasure to acknowledge useful discussions with\nA. Akhmerov, E. Altman, R. Bhatt, F. Cr\u00e9pin, T. Giamarchi,\nW. Hofstetter, D. Huse, J. Moore, O. Motrunich,\nA. Polkovnikov, N. Prokof'ev, S. Raghu, B. Svistunov,\nN. Trivedi, and A. Turner. We particularly thank B. Clark for\npointing out how to estimate errors on the critical exponents\nthat we obtain from scaling collapse and an anonymous referee\nfor helpful comments on sources of error to incorporate into\nour estimates. S.I. would like to acknowledge R. Dondero for\nhelpful suggestions for resolving problems with the RG code.\nS.I. would also like to express gratitude to the organizers of\nthe 2010 Boulder School for Condensed Matter and Materials\nPhysics, the 2011 Carg\u00e8se School on Disordered Systems,\nand the 2011 Princeton Summer School for Condensed Matter\nPhysics. S.I. and D.P. both thank the 2010 International Centre\nfor Theoretical Sciences School in Mysore. This material is\nbased upon work supported, in part, by the National Science\nFoundation under Grant No. 1066293 and the hospitality of the Aspen Center for Physics.D.P. acknowledges financial support\nby the Lee A. DuBridge Fellowship, and G.R. acknowledges\nsupport from the Packard Foundation.\n\nPublished - Iyer2012p17708Phys_Rev_B.pdf
", "abstract": "We study the zero-temperature superfluid-insulator transition for a two-dimensional model of interacting, lattice bosons in the presence of quenched disorder and particle-hole symmetry. We follow the approach of a recent series of papers by Altman, Kafri, Polkovnikov, and Refael, in which the strong disorder renormalization group is used to study disordered bosons in one dimension. Adapting this method to two dimensions, we study several different species of disorder and uncover universal features of the superfluid-insulator transition. In particular, we locate an unstable finite disorder fixed point that governs the transition between the superfluid and a gapless, glassy insulator. We present numerical evidence that this glassy phase is the incompressible Mott glass and that the transition from this phase to the superfluid is driven by a percolation-type process. Finally, we provide estimates of the critical exponents governing this transition.", "date": "2012-03-14", "date_type": "published", "publication": "Physical Review B", "volume": "85", "number": "9", "publisher": "American Physical Society", "pagerange": "Art. No. 094202", "id_number": "CaltechAUTHORS:20120406-125838850", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120406-125838850", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "1066293" }, { "agency": "Lee A. DuBridge Fellowship" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.85.094202", "primary_object": { "basename": "Iyer2012p17708Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/29b51-apt52/files/Iyer2012p17708Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2012", "author_list": "Iyer, S.; Pekker, D.; et el." }, { "id": "https://authors.library.caltech.edu/records/86mty-znh62", "eprint_id": 29799, "eprint_status": "archive", "datestamp": "2023-08-19 10:00:58", "lastmod": "2023-10-24 22:27:53", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pereg-Barnea-T", "name": { "family": "Pereg-Barnea", "given": "T." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } } ] }, "title": "Inducing topological order in a honeycomb lattice", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2012 American Physical Society.\n\nReceived 23 November 2010; revised manuscript received 7 February 2012; published 22 February 2012.\nThe authors would like to acknowledge useful discussions\nwith J. Alicea, M. Franz, J. Lau, N. H. Lindner, and J. Simon.\nG.R. is grateful for the generous support of the Packard\nFoundation and the FENA Focus Center, one of six research\ncenters funded under the Focus Center Research Program\n(FCRP), a Semiconductor Research Corporation entity. T.P.B.\nand G.R are supported by the Research Corporation Cottrell\nScholars Award, and DARPA. T.P.B. was also supported by\nthe National Science and Engineering Council of Canada.\n\nPublished - PeregBarnea2012p17422Phys_Rev_B.pdf
", "abstract": "We explore the possibility of inducing a topological insulator phase in a honeycomb lattice lacking spin-orbit interaction using a metallic (or Fermi gas) environment. The lattice and the metallic environment interact through a density-density interaction without particle tunneling, and integrating out the metallic environment produces a honeycomb sheet with in-plane oscillating long-ranged interactions. We find the ground state of the interacting system in a variational mean-field method and show that the Fermi wave vector k_F of the metal determines which phase occurs in the honeycomb lattice sheet. This is analogous to the Ruderman-Kittel-Kasuya-Yosida (RKKY) mechanism in which the metal's k_F determines the interaction profile as a function of the distance. Tuning k_F and the interaction strength may lead to a variety of ordered phases, including a topological insulator and anomalous quantum-Hall states with complex next-nearest-neighbor hopping, as in the Haldane and the Kane-Mele model. We estimate the required range of parameters needed for the topological state and find that the Fermi vector of the metallic gate should be of the order of 3\u03c0/8a (with a being the graphene lattice constant). The net coupling between the layers, which includes screening in the metal, should be of the order of the honeycomb lattice bandwidth. This configuration should be most easily realized in a cold-atoms setting with two interacting Fermionic species.", "date": "2012-02-22", "date_type": "published", "publication": "Physical Review B", "volume": "85", "number": "7", "publisher": "American Physical Society", "pagerange": "Art. No. 075127", "id_number": "CaltechAUTHORS:20120321-105734817", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120321-105734817", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Packard Foundation" }, { "agency": "Focus Center Research Program (FCRP) FENA Focus Center" }, { "agency": "Research Corporation Cottrell Scholars Award" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "National Science and Engineering Council of Canada (NSERC)" } ] }, "doi": "10.1103/PhysRevB.85.075127", "primary_object": { "basename": "PeregBarnea2012p17422Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/86mty-znh62/files/PeregBarnea2012p17422Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2012", "author_list": "Pereg-Barnea, T. and Refael, G." }, { "id": "https://authors.library.caltech.edu/records/yvkvs-3n480", "eprint_id": 29149, "eprint_status": "archive", "datestamp": "2023-08-19 09:31:02", "lastmod": "2023-10-24 18:24:02", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Romito-A", "name": { "family": "Romito", "given": "Alessandro" } }, { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Manipulating Majorana fermions using supercurrents", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2012 American Physical Society.\n\nReceived 8 November 2011; revised 19 December 2011; published 6 January 2012.\n\nWe thank P. Brouwer, L. Jiang, and\nA. Morpurgo for useful discussions, and the Aspen Center\nfor Physics for hospitality. We acknowledge support from\nthe Deutsche Forschungsgemeinschaft through Priority Program\n1285, the Moore Foundation and the National Science\nFoundation through the IQIM, as well as the National Science\nFoundation through Grant No. DMR-1055522.\n\nPublished - Romito2012p17002Phys_Rev_B.pdf
Submitted - 1110.6193v2.pdf
", "abstract": "Topological insulator edges and spin-orbit-coupled quantum wires in proximity to s-wave superconductors can be tuned through a topological quantum phase transition by a Zeeman field. Here we show that a supercurrent flowing in the s-wave superconductor also drives such a transition. We propose to use this mechanism to generate and manipulate Majorana fermions that localize at domain walls between topological and nontopological regions of an edge or wire. In quantum wires, this method carries the added benefit that a supercurrent reduces the critical Zeeman field at which the topological phase appears.", "date": "2012-01-06", "date_type": "published", "publication": "Physical Review B", "volume": "85", "number": "2", "publisher": "American Physical Society", "pagerange": "020502", "id_number": "CaltechAUTHORS:20120206-102258105", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120206-102258105", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Deutsche Forschungsgemeinschaft (DFG) Priority Program", "grant_number": "1285" }, { "agency": "Moore Foundation" }, { "agency": "NSF IQIM" }, { "agency": "NSF", "grant_number": "DMR-1055522" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevB.85.020502", "primary_object": { "basename": "1110.6193v2.pdf", "url": "https://authors.library.caltech.edu/records/yvkvs-3n480/files/1110.6193v2.pdf" }, "related_objects": [ { "basename": "Romito2012p17002Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/yvkvs-3n480/files/Romito2012p17002Phys_Rev_B.pdf" } ], "resource_type": "article", "pub_year": "2012", "author_list": "Romito, Alessandro; Alicea, Jason; et el." }, { "id": "https://authors.library.caltech.edu/records/cxmwp-zsg75", "eprint_id": 28648, "eprint_status": "archive", "datestamp": "2023-08-19 08:43:45", "lastmod": "2023-10-24 18:03:04", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Jiang-Liang", "name": { "family": "Jiang", "given": "Liang" }, "orcid": "0000-0002-0000-9342" }, { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Unconventional Josephson Signatures of Majorana Bound States", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2011 American Physical Society.\n\nReceived 27 July 2011; published 28 November 2011.\n\nIt is a pleasure to thank M. P. A. Fisher, L. Glazman, J.\nPreskill, A. Kitaev, A. Stern, J. Meyer, K. Shtengel, C.\nMarcus, L. Kouwenhoven, and B. Halperin for useful\ndiscussions, and the Aspen Center for Physics for hospitality. We are also grateful for support from BSF, SPP1285 (DFG), the Packard Foundation, the Sherman-Fairchild\nFoundation, the Moore Foundation funded CEQS, and the NSF through Grant No. DMR-1055522 and IQI Grants No. PHY-0456720 and No. PHY-0803371.\n\nPublished - Jiang2011p16644Phys_Rev_Lett.pdf
Submitted - 1107.4102v1.pdf
Supplemental Material - README.TXT
Supplemental Material - fig_Det.eps
Supplemental Material - mtran-final-supp.bbl
Supplemental Material - mtran-final-supp.pdf
Supplemental Material - mtran-final-supp.tex
", "abstract": "A junction between two topological superconductors containing a pair of Majorana fermions exhibits a \"fractional\" Josephson effect, 4\u03c0 periodic in the superconductors' phase difference. An additional fractional Josephson effect, however, arises when the Majorana fermions are spatially separated by a superconducting barrier. This new term gives rise to a set of Shapiro steps which are essentially absent without Majorana modes and therefore provides a unique signature for these exotic states.", "date": "2011-11-28", "date_type": "published", "publication": "Physical Review Letters", "volume": "107", "number": "23", "publisher": "American Physical Society", "pagerange": "236401", "id_number": "CaltechAUTHORS:20120104-113454842", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20120104-113454842", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP1285" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Sherman Fairchild Foundation" }, { "agency": "Gordon and Betty Moore Foundation" }, { "agency": "NSF", "grant_number": "DMR-1055522" }, { "agency": "NSF", "grant_number": "PHY-0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.107.236401", "primary_object": { "basename": "Jiang2011p16644Phys_Rev_Lett.pdf", "url": "https://authors.library.caltech.edu/records/cxmwp-zsg75/files/Jiang2011p16644Phys_Rev_Lett.pdf" }, "related_objects": [ { "basename": "README.TXT", "url": "https://authors.library.caltech.edu/records/cxmwp-zsg75/files/README.TXT" }, { "basename": "fig_Det.eps", "url": "https://authors.library.caltech.edu/records/cxmwp-zsg75/files/fig_Det.eps" }, { "basename": "mtran-final-supp.bbl", "url": "https://authors.library.caltech.edu/records/cxmwp-zsg75/files/mtran-final-supp.bbl" }, { "basename": "mtran-final-supp.pdf", "url": "https://authors.library.caltech.edu/records/cxmwp-zsg75/files/mtran-final-supp.pdf" }, { "basename": "mtran-final-supp.tex", "url": "https://authors.library.caltech.edu/records/cxmwp-zsg75/files/mtran-final-supp.tex" }, { "basename": "1107.4102v1.pdf", "url": "https://authors.library.caltech.edu/records/cxmwp-zsg75/files/1107.4102v1.pdf" } ], "resource_type": "article", "pub_year": "2011", "author_list": "Jiang, Liang; Pekker, David; et el." }, { "id": "https://authors.library.caltech.edu/records/4yetq-q2796", "eprint_id": 28500, "eprint_status": "archive", "datestamp": "2023-08-19 08:42:33", "lastmod": "2023-10-24 17:56:30", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Meidan-D", "name": { "family": "Meidan", "given": "Dganit" } }, { "id": "Rosenow-B", "name": { "family": "Rosenow", "given": "Bernd" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Gapless Excitations in Strongly Fluctuating Superconducting Wires", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2011 American Physical Society. Received 8 August 2011; published 22 November 2011. We acknowledge helpful discussions with E. A. Demler, B. I. Halperin, P. A. Lee, and T. Senthil. We thank the Packard Foundation, BSF, DIP, the Alexander von Humboldt Foundation and the Aspen Center for Physics.\n\nPublished - Meidan2011p16487Phys_Rev_Lett.pdf
Supplemental Material - README.TXT
Supplemental Material - self_energy1.eps
Supplemental Material - supp.pdf
Supplemental Material - supp.tex
", "abstract": "We study the low-temperature tunneling density of states of thin wires where superconductivity is destroyed through quantum phase-slip proliferation. Although this regime is believed to behave as an insulator, we show that for a large temperature range this phase is characterized by a conductivity falling off at most linearly with temperature, and has a gapless excitation spectrum. This novel conducting phase results from electron-electron interaction induced pair breaking. Also, it may help clarify the low-temperature metallic features found in films and wires whose bulk realization is superconducting.", "date": "2011-11-22", "date_type": "published", "publication": "Physical Review Letters", "volume": "107", "number": "22", "publisher": "American Physical Society", "pagerange": "Art. No. 227004", "id_number": "CaltechAUTHORS:20111216-150959334", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111216-150959334", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Packard Foundation" }, { "agency": "BSF" }, { "agency": "DIP" }, { "agency": "Alexander von Humboldt Foundation" }, { "agency": "Aspen Center for Physics" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.107.227004", "primary_object": { "basename": "self_energy1.eps", "url": "https://authors.library.caltech.edu/records/4yetq-q2796/files/self_energy1.eps" }, "related_objects": [ { "basename": "supp.pdf", "url": "https://authors.library.caltech.edu/records/4yetq-q2796/files/supp.pdf" }, { "basename": "supp.tex", "url": "https://authors.library.caltech.edu/records/4yetq-q2796/files/supp.tex" }, { "basename": "Meidan2011p16487Phys_Rev_Lett.pdf", "url": "https://authors.library.caltech.edu/records/4yetq-q2796/files/Meidan2011p16487Phys_Rev_Lett.pdf" }, { "basename": "README.TXT", "url": "https://authors.library.caltech.edu/records/4yetq-q2796/files/README.TXT" } ], "resource_type": "article", "pub_year": "2011", "author_list": "Meidan, Dganit; Rosenow, Bernd; et el." }, { "id": "https://authors.library.caltech.edu/records/sp7k2-ne403", "eprint_id": 27914, "eprint_status": "archive", "datestamp": "2023-08-19 08:24:05", "lastmod": "2023-10-24 17:30:31", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Karzig-T", "name": { "family": "Karzig", "given": "Torsten" }, "orcid": "0000-0003-0834-0547" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Glazman-L-I", "name": { "family": "Glazman", "given": "Leonid I." } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Energy Partitioning of Tunneling Currents into Luttinger Liquids", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2011 American Physical Society. \n\nReceived 19 August 2011; published 18 October 2011. \n\nWe acknowledge discussions with G. Barak, A. Levchenko, T. Micklitz, and A. Yacoby, financial support through DFG SPP 1538 (FUB), DOE Contract No. DE-FG02-08ER46482 (Yale), and the Packard Foundation (Caltech), as well as the hospitality of the Aspen Center for Physics during part of this work.\n\nPublished - Karzig2011p16276Phys_Rev_Lett_2.pdf
", "abstract": "Tunneling of electrons of definite chirality into a quantum wire creates counterpropagating excitations, carrying both charge and energy. We find that the partitioning of energy is qualitatively different from that of charge. The partition ratio of energy depends on the excess energy of the tunneling electrons (controlled by the applied bias) and on the interaction strength within the wire (characterized by the Luttinger-liquid parameter \u03ba), while the partitioning of charge is fully determined by \u03ba. Moreover, unlike for charge currents, the partitioning of energy current should manifest itself in dc experiments on wires contacted by conventional (Fermi-liquid) leads.", "date": "2011-10-18", "date_type": "published", "publication": "Physical Review Letters", "volume": "107", "number": "17", "publisher": "American Physical Society", "pagerange": "Art. No. 176403", "id_number": "CaltechAUTHORS:20111122-110805328", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111122-110805328", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP 1538" }, { "agency": "Department of Energy (DOE)", "grant_number": "DE-FG02-08ER46482" }, { "agency": "David and Lucile Packard Foundation" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.107.176403", "primary_object": { "basename": "Karzig2011p16276Phys_Rev_Lett_2.pdf", "url": "https://authors.library.caltech.edu/records/sp7k2-ne403/files/Karzig2011p16276Phys_Rev_Lett_2.pdf" }, "resource_type": "article", "pub_year": "2011", "author_list": "Karzig, Torsten; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/kk0ys-35x56", "eprint_id": 24379, "eprint_status": "archive", "datestamp": "2023-08-19 07:15:42", "lastmod": "2023-10-23 22:37:49", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Goldbart-P-M", "name": { "family": "Goldbart", "given": "Paul M." } } ] }, "title": "Weber Blockade Theory of Magnetoresistance Oscillations in Superconducting Strips", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2011 American Physical Society.\n\nReceived 22 October 2010; published 30 June 2011.\nWe thank D. Shahar and J. Meyer for useful discussions,\nand the Aspen Center for Physics for its hospitality. This\nwork was supported by DOE DE-FG02-07ER46453\n(PMG), the Research Corporation, Packard and Sloan\nFoundation (G. R.), and the Du Bridge Foundation (D. P.).\n\nPublished - Pekker2011p14618Phys_Rev_Lett.pdf
", "abstract": "Recent experiments on the conductance of thin, narrow superconducting strips have found periodic fluctuations, as a function of the perpendicular magnetic field, with a period corresponding to approximately two flux quanta per strip area [A. Johansson et al., Phys. Rev. Lett. 95, 116805 (2005)]. We argue that the low-energy degrees of freedom responsible for dissipation correspond to vortex motion. Using vortex-charge duality, we show that the superconducting strip behaves as the dual of a quantum dot, with the vortices, magnetic field, and bias current respectively playing the roles of the electrons, gate voltage, and source-drain voltage. In the bias-current versus magnetic-field plane, the strip conductance displays regions of small vortex conductance (i.e., small electrical resistance) that we term \"Weber blockade\" diamonds, which are dual to Coulomb blockade diamonds in quantum dots.", "date": "2011-06-30", "date_type": "published", "publication": "Physical Review Letters", "volume": "107", "number": "1", "publisher": "American Physical Society", "pagerange": "Art. No. 017002", "id_number": "CaltechAUTHORS:20110712-110828545", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110712-110828545", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Department of Energy (DOE)", "grant_number": "DE-FG02-07ER46453" }, { "agency": "Research Corporation" }, { "agency": "Packard and Sloan Foundation" }, { "agency": "Du Bridge Foundation" } ] }, "doi": "10.1103/PhysRevLett.107.017002", "primary_object": { "basename": "Pekker2011p14618Phys_Rev_Lett.pdf", "url": "https://authors.library.caltech.edu/records/kk0ys-35x56/files/Pekker2011p14618Phys_Rev_Lett.pdf" }, "resource_type": "article", "pub_year": "2011", "author_list": "Pekker, David; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/bqkpg-svp12", "eprint_id": 24148, "eprint_status": "archive", "datestamp": "2023-09-18 20:46:59", "lastmod": "2023-10-23 22:33:50", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Jiang-Liang", "name": { "family": "Jiang", "given": "Liang" }, "orcid": "0000-0002-0000-9342" }, { "id": "Kitagawa-Takuya", "name": { "family": "Kitagawa", "given": "Takuya" } }, { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "Akhmerov-", "name": { "family": "Akhmerov", "given": "A. R." } }, { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Cirac-J-I", "name": { "family": "Cirac", "given": "J. Ignacio" } }, { "id": "Demler-E-A", "name": { "family": "Demler", "given": "Eugene" } }, { "id": "Lukin-M-D", "name": { "family": "Lukin", "given": "Mikhail D." }, "orcid": "0000-0002-8658-1007" }, { "id": "Zoller-P", "name": { "family": "Zoller", "given": "Peter" } } ] }, "title": "Majorana Fermions in Equilibrium and in Driven Cold-Atom Quantum Wires", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2011 American Physical Society. Received 26 February 2011; revised 27 April 2011; published 2 June 2011. We would like to thank Ian Spielman for enlightening\ndiscussions. This work was supported by the Sherman\nFairchild Foundation, DARPA OLE program, CUA, NSF, AFOSR Quantum Simulation MURI, AFOSR MURI on Ultracold Molecules, ARO-MURI on Atomtronics, and Dutch Science Foundation NWO/FOM.\n\nPublished - Jiang2011p14114Phys_Rev_Lett.pdf
Supplemental Material - ColdAtomsMF_EPAPS_20110507.pdf
Supplemental Material - README.TXT
", "abstract": "We introduce a new approach to create and detect Majorana fermions using optically trapped 1D fermionic atoms. In our proposed setup, two internal states of the atoms couple via an optical Raman transition\u2014simultaneously inducing an effective spin-orbit interaction and magnetic field\u2014while a background molecular BEC cloud generates s-wave pairing for the atoms. The resulting cold-atom quantum wire supports Majorana fermions at phase boundaries between topologically trivial and nontrivial regions, as well as \"Floquet Majorana fermions\" when the system is periodically driven. We analyze experimental parameters, detection schemes, and various imperfections.", "date": "2011-06-02", "date_type": "published", "publication": "Physical Review Letters", "volume": "106", "number": "22", "publisher": "American Physical Society", "pagerange": "Art. No. 220402", "id_number": "CaltechAUTHORS:20110621-093218853", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110621-093218853", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Sherman Fairchild Foundation" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Harvard-MIT Center for Ultracold Atoms" }, { "agency": "NSF" }, { "agency": "Air Force Office of Scientific Research (AFOSR)" }, { "agency": "Army Research Office (ARO)" }, { "agency": "Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)" }, { "agency": "Stichting voor Fundamenteel Onderzoek der Materie (FOM)" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.106.220402", "primary_object": { "basename": "ColdAtomsMF_EPAPS_20110507.pdf", "url": "https://authors.library.caltech.edu/records/bqkpg-svp12/files/ColdAtomsMF_EPAPS_20110507.pdf" }, "related_objects": [ { "basename": "Jiang2011p14114Phys_Rev_Lett.pdf", "url": "https://authors.library.caltech.edu/records/bqkpg-svp12/files/Jiang2011p14114Phys_Rev_Lett.pdf" }, { "basename": "README.TXT", "url": "https://authors.library.caltech.edu/records/bqkpg-svp12/files/README.TXT" } ], "resource_type": "article", "pub_year": "2011", "author_list": "Jiang, Liang; Kitagawa, Takuya; et el." }, { "id": "https://authors.library.caltech.edu/records/2h34p-pca10", "eprint_id": 24150, "eprint_status": "archive", "datestamp": "2023-08-22 02:48:07", "lastmod": "2023-10-23 20:20:34", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lindner-N-H", "name": { "family": "Lindner", "given": "Netanel H." }, "orcid": "0000-0003-1879-3902" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Galitski-V", "name": { "family": "Galitski", "given": "Victor" } } ] }, "title": "Floquet topological insulator in semiconductor quantum wells", "ispublished": "pub", "full_text_status": "restricted", "keywords": "Condensed-matter physics; Materials physics", "note": "\u00a9 2011 Macmillan Publishers Limited. Received 02 September 2010. Accepted 14 January 2011. Published online 13 March 2011. We thank J. Avron, A. Auerbach, E. Berg, A. Bernevig, J. Eisenstein, L. Fidkowski, V. Gurarie, I. Klich, and A. Polkovnikov for illuminating conversations. This research\nwas supported by DARPA (G.R., V.G.), NSF grants PHY-0456720 and PHY-0803371 (G.R., N.H.L.). N.H.L. acknowledges the financial support of the Rothschild Foundation and the Gordon and Betty Moore Foundation. Author contributions:\nN.H.L., G.R. and V.G. contributed to the conceptual developments. N.H.L. carried out the mathematical analysis.", "abstract": "Topological phases of matter have captured our imagination over the past few years, with tantalizing properties such as robust edge modes and exotic non-Abelian excitations, and potential applications ranging from semiconductor spintronics to topological quantum computation. Despite recent advancements in the field, our ability to control topological transitions remains limited, and usually requires changing material or structural properties. We show, using Floquet theory, that a topological state can be induced in a semiconductor quantum well, initially in the trivial phase. This can be achieved by irradiation with microwave frequencies, without changing the well structure, closing the gap and crossing the phase transition. We show that the quasi-energy spectrum exhibits a single pair of helical edge states. We discuss the necessary experimental parameters for our proposal. This proposal provides an example and a proof of principle of a new non-equilibrium topological state, the Floquet topological insulator, introduced in this paper.", "date": "2011-06", "date_type": "published", "publication": "Nature Physics", "volume": "7", "number": "6", "publisher": "Nature Publishing Group", "pagerange": "490-495", "id_number": "CaltechAUTHORS:20110621-100028234", "issn": "1745-2473", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110621-100028234", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "NSF", "grant_number": "PHY-0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371" }, { "agency": "Rothschild Foundation" }, { "agency": "Gordon and Betty Moore Foundation" } ] }, "doi": "10.1038/nphys1926", "resource_type": "article", "pub_year": "2011", "author_list": "Lindner, Netanel H.; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/cbske-gh304", "eprint_id": 23771, "eprint_status": "archive", "datestamp": "2023-08-22 02:38:37", "lastmod": "2023-10-23 19:55:40", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } }, { "id": "Fisher-Matthew-P-A", "name": { "family": "Fisher", "given": "Matthew P. A." } } ] }, "title": "Non-Abelian statistics and topological quantum information processing in 1D wire networks", "ispublished": "pub", "full_text_status": "public", "keywords": "Quantum physics; Information theory and computation; Electronics, photonics and device physics", "note": "\u00a9 2011 Nature Publishing Group. \nReceived 29 June 2010; accepted 22 December 2010;\npublished online 13 February 2011. We have benefited greatly from stimulating conversations with P. Bonderson, S. Das Sarma, L. Fidkowski, E. Henriksen, A. Kitaev, P. Lee, X. Qi and A. Stern. We also gratefully acknowledge support from the Lee A. DuBridge Foundation, ISF, BSF, DIP and SPP 1285 grants, Packard and Sloan fellowships, the Institute for Quantum Information under NSF grants PHY-0456720 and PHY-0803371, and the National Science Foundation through grant DMR-0529399. \nAuthor contributions:\nAll authors contributed to the inception of the ideas in the manuscript, design of networks\nand proposed experimental setups, and proof of non-Abelian statistics.\n\nAccepted Version - 1006.4395.pdf
", "abstract": "The synthesis of a quantum computer remains an ongoing challenge in modern physics. Whereas decoherence stymies most approaches, topological quantum computation schemes evade decoherence at the hardware level by storing quantum information non-locally. Here we establish that a key operation\u2014braiding of non-Abelian anyons\u2014can be implemented using one-dimensional semiconducting wires. Such wires can be driven into a topological phase supporting long-sought particles known as Majorana fermions that can encode topological qubits. We show that in wire networks, Majorana fermions can be meaningfully braided by simply adjusting gate voltages, and that they exhibit non-Abelian statistics like vortices in a p+ip superconductor. We propose experimental set-ups that enable probing of the Majorana fusion rules and the efficient exchange of arbitrary numbers of Majorana fermions. This work should open a new direction in topological quantum computation that benefits from physical transparency and experimental feasibility.", "date": "2011-05", "date_type": "published", "publication": "Nature Physics", "volume": "7", "number": "5", "publisher": "Nature Publishing Group", "pagerange": "412-417", "id_number": "CaltechAUTHORS:20110524-084153167", "issn": "1745-2473", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110524-084153167", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Lee A. DuBridge Foundation" }, { "agency": "ISF" }, { "agency": "BSF" }, { "agency": "DIP" }, { "agency": "SPP", "grant_number": "1285" }, { "agency": "Packard and Sloan Foundations" }, { "agency": "Institute for Quantum Information under NSF", "grant_number": "PHY-0456720" }, { "agency": "Institute for Quantum Information under NSF", "grant_number": "PHY-0803371" }, { "agency": "NSF", "grant_number": "DMR-0529399" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "primary_object": { "basename": "1006.4395.pdf", "url": "https://authors.library.caltech.edu/records/cbske-gh304/files/1006.4395.pdf" }, "resource_type": "article", "pub_year": "2011", "author_list": "Alicea, Jason; Oreg, Yuval; et el." }, { "id": "https://authors.library.caltech.edu/records/v5hpe-2sy82", "eprint_id": 23764, "eprint_status": "archive", "datestamp": "2023-08-19 06:15:34", "lastmod": "2023-10-23 19:55:21", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Robertson-A", "name": { "family": "Robertson", "given": "Andrew" } }, { "id": "Galitski-V-M", "name": { "family": "Galitski", "given": "Victor M." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Dynamic Stimulation of Quantum Coherence in Systems of Lattice Bosons", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2011 American Physical Society.\n\nReceived 29 November 2010; revised 10 February 2011; published 20 April 2011.\n\nThe authors are grateful to Ehud Altman, William\nPhillips, and Hong Ling for illuminating discussions of\nthis topic. This research was supported by JQI-PFC\n(A. R.), DARPA and U.S.-ARO (V. G.), and the Packard\nFoundation, Sloan Foundation, and NSF Grants No. PHY-\n0456720 and No. PHY-0803371 (G. R.).\n\nPublished - Robertson2011p13805Phys_Rev_Lett.pdf
", "abstract": "Thermal fluctuations tend to destroy long-range phase correlations. Consequently, bosons in a lattice will undergo a transition from a phase-coherent superfluid as the temperature rises. Contrary to common intuition, however, we show that nonequilibrium driving can be used to reverse this thermal decoherence. This is possible because the energy distribution at equilibrium is rarely optimal for the manifestation of a given quantum property. We demonstrate this in the Bose-Hubbard model by calculating the nonequilibrium spatial correlation function with periodic driving. We show that the nonequilibrium phase boundary between coherent and incoherent states at finite bath temperatures can be made qualitatively identical to the familiar zero-temperature phase diagram, and we discuss the experimental manifestation of this phenomenon in cold atoms.", "date": "2011-04-20", "date_type": "published", "publication": "Physical Review Letters", "volume": "106", "number": "16", "publisher": "American Physical Society", "pagerange": "Art. No. 165701", "id_number": "CaltechAUTHORS:20110523-102744616", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110523-102744616", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "JQI-PFC" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "Army Research Office (ARO)" }, { "agency": "Packard Foundation" }, { "agency": "Sloan Foundation" }, { "agency": "NSF", "grant_number": "PHY- 0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371" } ] }, "doi": "10.1103/PhysRevLett.106.165701", "primary_object": { "basename": "Robertson2011p13805Phys_Rev_Lett.pdf", "url": "https://authors.library.caltech.edu/records/v5hpe-2sy82/files/Robertson2011p13805Phys_Rev_Lett.pdf" }, "resource_type": "article", "pub_year": "2011", "author_list": "Robertson, Andrew; Galitski, Victor M.; et el." }, { "id": "https://authors.library.caltech.edu/records/r0d6p-ayb37", "eprint_id": 23115, "eprint_status": "archive", "datestamp": "2023-08-19 04:44:33", "lastmod": "2023-10-23 17:56:16", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zou-Y", "name": { "family": "Zou", "given": "Yue" } }, { "id": "Barnett-R", "name": { "family": "Barnett", "given": "Ryan" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Particle-hole symmetric localization in optical lattices using time modulated random on-site potentials", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society. Received 22 July 2010; published 15 December 2010. For particularly useful discussions we thank J. Biddle, L. Fallani, S. Rolston, I. Spielman, and B. Wu. We would like to acknowledge support from the Joint Quantum Institute Physics Frontier Center and the Sherman Fairchild Foundation (R.B.); and the Packard Foundation, Sloan Foundation, and the research corporation, as well as Darpa, and NSF Grants No. PHY-0456720 and No. PHY-0803371 (G.R.).\n\nPublished - Zou2010p12790Phys_Rev_B.pdf
", "abstract": "The random hopping models exhibit many fascinating features, such as diverging localization length and\ndensity of states as energy approaches the band center due to its particle-hole symmetry. Nevertheless, such\nmodels are yet to be realized experimentally because the particle-hole symmetry is easily destroyed by diagonal\ndisorder. Here we propose that a pure random hopping model can be effectively realized in ultracold\natoms by modulating a disordered onsite potential in particular frequency ranges. This idea is motivated by the\nrecent development of the phenomena called \"dynamical localization\" or \"coherent destruction of tunneling.\"\nInvestigating the application of this idea in one dimension, we find that if the oscillation frequency of the\ndisorder potential is gradually increased from zero to infinity, one can tune a noninteracting system from an\nAnderson insulator to a random hopping model with diverging localization length at the band center, and\neventually to a uniform-hopping tight-binding model.", "date": "2010-12-15", "date_type": "published", "publication": "Physical Review B", "volume": "82", "number": "22", "publisher": "American Physical Society", "pagerange": "Art. No. 224205", "id_number": "CaltechAUTHORS:20110328-082217476", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20110328-082217476", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Joint Quantum Institute of Physics Frontier Center" }, { "agency": "Sherman Fairchild Foundation" }, { "agency": "Packard Foundation" }, { "agency": "Sloan Foundation" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "NSF", "grant_number": "PHY-0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371" } ] }, "doi": "10.1103/PhysRevB.82.224205", "primary_object": { "basename": "Zou2010p12790Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/r0d6p-ayb37/files/Zou2010p12790Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Zou, Yue; Barnett, Ryan; et el." }, { "id": "https://authors.library.caltech.edu/records/sh9jq-2w304", "eprint_id": 21351, "eprint_status": "archive", "datestamp": "2023-08-19 04:26:38", "lastmod": "2023-10-20 23:58:01", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Guo-H-M", "name": { "family": "Guo", "given": "H.-M." } }, { "id": "Rosenberg-G", "name": { "family": "Rosenberg", "given": "G." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Franz-M", "name": { "family": "Franz", "given": "M." } } ] }, "title": "Topological Anderson Insulator in Three Dimensions", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society.\nReceived 1 August 2010; published 19 November 2010.\n\nThe authors acknowledge illuminating discussions with\nI. Garate, A. Kitaev, J. E. Moore, A. Vishwanath, C.Weeks,\nand S.-C. Zhang. The work was supported in part by\nNSERC, CIfAR (M. F.), China Scholarship Council\n(H. M. G.), the Packard Foundation, and the Research\nCorporation (G. R.).\n\nPublished - Guo2010p12094Phys_Rev_Lett.pdf
", "abstract": "We show that disorder, when sufficiently strong, can transform an ordinary metal with strong spin-orbit\ncoupling into a strong topological \"Anderson\" insulator, a new topological phase of quantum matter in\nthree dimensions characterized by disordered insulating bulk and topologically protected conducting\nsurface states.", "date": "2010-11-19", "date_type": "published", "publication": "Physical Review Letters", "volume": "105", "number": "21", "publisher": "American Physical Society", "pagerange": "Art. No. 216601", "id_number": "CaltechAUTHORS:20101214-105429377", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20101214-105429377", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Natural Sciences and Engineering Research Council of Canada (NSERC)" }, { "agency": "Canadian Institute for Advanced Research (CIFAR)" }, { "agency": "China Scholarship Council" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Research Corporation" } ] }, "doi": "10.1103/PhysRevLett.105.216601", "primary_object": { "basename": "Guo2010p12094Phys_Rev_Lett.pdf", "url": "https://authors.library.caltech.edu/records/sh9jq-2w304/files/Guo2010p12094Phys_Rev_Lett.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Guo, H.-M.; Rosenberg, G.; et el." }, { "id": "https://authors.library.caltech.edu/records/7t4d7-74y98", "eprint_id": 21376, "eprint_status": "archive", "datestamp": "2023-08-19 04:23:40", "lastmod": "2023-10-20 23:59:28", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bergman-D-L", "name": { "family": "Bergman", "given": "Doron L." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Bulk metals with helical surface states", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society.\n\nReceived 21 May 2010; revised manuscript received 13 October 2010; published 9 November 2010.\n\nIt is a pleasure to acknowledge useful discussions with\nP. A. Lee, O. Motrunich, Z. Hasan, and D. Hsieh. D.L.B. is\ngrateful for support by the Sherman Fairchild Foundation.\nG.R. is grateful for the generous support of the Packard\nFoundation, the Sloan Foundation, and the FENA Focus\nCenter, one of six research centers funded under the\nFocus Center Research Program (FCRP), a Semiconductor\nResearch Corporation entity.\n\nPublished - Bergman2010p12108Phys_Rev_B.pdf
", "abstract": "In the flurry of experiments looking for topological insulator materials, it has been recently discovered that some bulk metals very close to topological insulator electronic states support the same topological surface states that are the defining characteristic of the topological insulator. First observed in spin-polarized angle resolved photoemission spectroscopy (ARPES) in Sb [D. Hsieh et al., Science 323, 919 (2009)], the helical surface states in the metallic systems appear to be robust to at least mild disorder. We present here a theoretical investigation of the nature of these \"helical metals\"\u2014bulk metals with helical surface states. We explore how the surface and bulk states can mix, in both clean and disordered systems. Using the Fano model, we discover that in a clean system, the helical surface states are not simply absorbed by hybridization with a nontopological parasitic metallic band. Instead, they are pushed away from overlapping in momentum and energy with the bulk states, leaving behind a finite-lifetime surface resonance in the bulk energy band. Furthermore, the hybridization may lead in some cases to multiplied surface-state bands, in all cases retaining the helical characteristic. Weak disorder leads to very similar effects\u2014surface states are pushed away from the energy bandwidth of the bulk, leaving behind a finite-lifetime surface resonance in place of the original surface states.", "date": "2010-11-09", "date_type": "published", "publication": "Physical Review B", "volume": "82", "number": "19", "publisher": "American Physical Society", "pagerange": "Art. No. 195417", "id_number": "CaltechAUTHORS:20101215-110525362", "issn": "0163-1829", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20101215-110525362", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Sherman Fairchild Foundation" }, { "agency": "Focus Center Research Program (FCRP)" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Alfred P. Sloan Foundation" } ] }, "doi": "10.1103/PhysRevB.82.195417", "primary_object": { "basename": "Bergman2010p12108Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/7t4d7-74y98/files/Bergman2010p12108Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Bergman, Doron L. and Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/8gcth-pa111", "eprint_id": 20736, "eprint_status": "archive", "datestamp": "2023-08-19 04:07:58", "lastmod": "2023-10-20 23:23:21", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "von-Oppen-F", "name": { "family": "von Oppen", "given": "Felix" } } ] }, "title": "Helical Liquids and Majorana Bound States in Quantum Wires", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 American Physical Society.\n\nReceived 16 March 2010; published 20 October 2010.\n\nWe would like to thank J. Moore, J. Alicea, E. Berg, and\nO. Starykh for enlightening discussions. The research was\nsupported by ISF, DIP, BSF, and SPP 1285 grants, as well\nas the Packard and Sloan foundations, and by the Institute\nfor Quantum Information under NSF Grants No. PHY-0456720 and No. PHY-0803371.\n\nPublished - Oreg2010p11750Phys_Rev_Lett.pdf
Submitted - 1003.1145v2.pdf
", "abstract": "We show that the combination of spin-orbit coupling with a Zeeman field or strong interactions may lead to the formation of a helical electron liquid in single-channel quantum wires, with spin and velocity perfectly correlated. We argue that zero-energy Majorana bound states are formed in various situations when such wires are situated in proximity to a conventional s-wave superconductor. This occurs when the external magnetic field, the superconducting gap, or, most simply, the chemical potential vary along the wire. These Majorana states do not require the presence of a vortex in the system. Experimental consequences of the helical liquid and the Majorana states are also discussed.", "date": "2010-10-20", "date_type": "published", "publication": "Physical Review Letters", "volume": "105", "number": "17", "publisher": "American Physical Society", "pagerange": "177002", "id_number": "CaltechAUTHORS:20101109-122846688", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20101109-122846688", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Israel Science Foundation (ISF)" }, { "agency": "Deutsch-Israelische Projektkooperation (DIP)" }, { "agency": "Binational Science Foundation (BSF)" }, { "agency": "Priority Programme (SPP), Deutsche Forschungsgemeinschaft (DFG)", "grant_number": "SPP 1285" }, { "agency": "Packard Foundation" }, { "agency": "Sloan Foundation" }, { "agency": "NSF", "grant_number": "PHY-0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371" } ] }, "local_group": { "items": [ { "id": "IQIM" } ] }, "doi": "10.1103/PhysRevLett.105.177002", "primary_object": { "basename": "1003.1145v2.pdf", "url": "https://authors.library.caltech.edu/records/8gcth-pa111/files/1003.1145v2.pdf" }, "related_objects": [ { "basename": "Oreg2010p11750Phys_Rev_Lett.pdf", "url": "https://authors.library.caltech.edu/records/8gcth-pa111/files/Oreg2010p11750Phys_Rev_Lett.pdf" } ], "resource_type": "article", "pub_year": "2010", "author_list": "Oreg, Yuval; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/agg6a-mz722", "eprint_id": 20508, "eprint_status": "archive", "datestamp": "2023-08-19 03:51:39", "lastmod": "2023-10-20 23:07:54", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zou-Y", "name": { "family": "Zou", "given": "Yue" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Yoon-J", "name": { "family": "Yoon", "given": "Jongsoo" } } ] }, "title": "Theoretical analysis of drag resistance in amorphous thin films exhibiting superconductor-insulator transitions", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society.\n\nReceived 20 May 2010; published 20 September 2010.\n\nIt is a pleasure to thank Yonatan Dubi, Jim Eisenstein,\nAlexander Finkel'stein, Alex Kamenev, Yen-Hsiang Lin,\nYigal Meir, Yuval Oreg, Philip Phillips, Ady Stern, Jiansheng\nWu, and Ke Xu for stimulating discussions. This work was\nsupported by the Research Corporation's Cottrell award\n(G.R.), and by NSF through Grant No. DMR-0239450 (J.Y.).\n\nPublished - Zou2010p11545Phys_Rev_B.pdf
", "abstract": "The magnetical field tuned superconductor-insulator transition in amorphous thin films, e.g., Ta and InO,\nexhibits a range of yet unexplained curious phenomena, such as a putative low-resistance metallic phase\nintervening the superconducting and the insulating phase, and a huge peak in the magnetoresistance at large\nmagnetic field. Qualitatively, the phenomena can be explained equally well within several significantly different\npictures, particularly the condensation of quantum vortex liquid, and the percolation of superconducting\nislands embedded in normal region. Recently, we proposed and analyzed a distinct measurement in Y. Zou,\nG. Refael, and J. Yoon, Phys. Rev. B 80, 180503 (2009) that should be able to decisively point to the correct\npicture: a drag resistance measurement in an amorphous thin-film bilayer setup. Neglecting interlayer tunneling,\nwe found that the drag resistance within the vortex paradigm has opposite sign and is orders of magnitude\nlarger than that in competing paradigms. For example, two identical films as in G. Sambandamurthy, L. W.\nEngel, A. Johansson, and D. Shahar, Phys. Rev. Lett. 92, 107005 _2004_ with 25 nm layer separation at\n0.07 K would produce a drag resistance ~10^(\u22124) \u03a9 according the vortex theory but only ~10^(\u221212) \u03a9 for the\npercolation theory. We provide details of our theoretical analysis of the drag resistance within both paradigms\nand report some results as well.", "date": "2010-09-20", "date_type": "published", "publication": "Physical Review B", "volume": "82", "number": "10", "publisher": "American Physical Society", "pagerange": "Art. No. 104515", "id_number": "CaltechAUTHORS:20101025-114133254", "issn": "0163-1829", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20101025-114133254", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Research Corporation Cottrell Award" }, { "agency": "NSF", "grant_number": "DMR-0239450" } ] }, "doi": "10.1103/PhysRevB.82.104515", "primary_object": { "basename": "Zou2010p11545Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/agg6a-mz722/files/Zou2010p11545Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Zou, Yue; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/mrbrb-p9g51", "eprint_id": 20046, "eprint_status": "archive", "datestamp": "2023-08-19 03:45:20", "lastmod": "2023-10-20 22:10:25", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lee-T-E", "name": { "family": "Lee", "given": "Tony E." } }, { "id": "Tam-H", "name": { "family": "Tam", "given": "Heywood" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Rogers-J-L", "name": { "family": "Rogers", "given": "Jeffrey L." } }, { "id": "Cross-M-C", "name": { "family": "Cross", "given": "M. C." } } ] }, "title": "Vortices and the entrainment transition in the two-dimensional Kuramoto model", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society.\n\nReceived 24 June 2010; published 2 September 2010.\n\nThis work was supported by Boeing. G.R. thanks the Research\nCorporation and the Packard Foundation for their\ngenerous support.\n\nPublished - Lee2010p11375Phys_Rev_E.pdf
", "abstract": "We study synchronization in the two-dimensional lattice of coupled phase oscillators with random intrinsic frequencies. When the coupling K is larger than a threshold K_E, there is a macroscopic cluster of frequency-synchronized oscillators. We explain why the macroscopic cluster disappears at K_E. We view the system in terms of vortices, since cluster boundaries are delineated by the motion of these topological defects. In the entrained phase (K>K_E), vortices move in fixed paths around clusters, while in the unentrained phase (K", "date": "2010-09-02", "date_type": "published", "publication": "Physical Review E", "volume": "82", "number": "3", "publisher": "American Physical Society", "pagerange": "Art. No. 036202", "id_number": "CaltechAUTHORS:20100920-105131252", "issn": "1539-3755", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100920-105131252", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Boeing" }, { "agency": "Research Corporation" }, { "agency": "Packard Foundation" } ] }, "doi": "10.1103/PhysRevE.82.036202", "primary_object": { "basename": "Lee2010p11375Phys_Rev_E.pdf", "url": "https://authors.library.caltech.edu/records/mrbrb-p9g51/files/Lee2010p11375Phys_Rev_E.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Lee, Tony E.; Tam, Heywood; et el." }, { "id": "https://authors.library.caltech.edu/records/kse1z-c6j35", "eprint_id": 20752, "eprint_status": "archive", "datestamp": "2023-08-19 03:37:12", "lastmod": "2023-10-20 23:24:23", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Halperin-B-I", "name": { "family": "Halperin", "given": "Bertrand I." }, "orcid": "0000-0002-6999-1039" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Demler-E", "name": { "family": "Demler", "given": "Eugene" } } ] }, "title": "Resistance in Superconductors", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 2010 World Scientific Publishing Company.\n\nThe authors have benefited from discussions with many people on topics of\nthis review, including, in recent years, M. Tinkham, Y. Oreg, A. Bezryadin,\nI. Aleiner, D. S. Fisher, M. P. A. Fisher, V. Galitskii, and C. L. Lobb.\nThey acknowledge support from t he Packard Foundation, a Cottrell Fellowship\nfrom the Research Corporation, and NSF grants DMR-0906475 and\nDMR-0705472.", "abstract": "In this pedagogical review, we discuss how electrical resistance can arise in superconductors. Starting with the idea of the superconducting order parameter as a condensate wave function, we introduce vortices as topological excitations with quantized phase winding, and we show how phase slips occur when vortices cross the sample. Superconductors exhibit non-zero electrical resistance under circumstances where phase slips occur at a finite rate. For one-dimensional superconductors or Josephson junctions, phase slips can occur at isolated points in space-time. Phase slip rates may be controlled by thermal activation over a free-energy barrier, or in some circumstances, at low temperatures, by quantum tunneling through a barrier. We present an overview of several phenomena involving vortices that have direct implications for the electrical resistance of superconductors, including the Berezinskii-Kosterlitz-Thouless transition for vortex-proliferation in thin films, and the effects of vortex pinning in bulk type II superconductors on the nonlinear resistivity of these materials in an applied magnetic field. We discuss how quantum fluctuations can cause phase slips and review the non-trivial role of dissipation on such fluctuations. We present a basic picture of the superconductor-to-insulator quantum phase transitions in films, wires, and Josephson junctions. We point out related problems in superfluid helium films and systems of ultra-cold trapped atoms. While our emphasis is on theoretical concepts, we also briefly describe experimental results, and we underline some of the open questions.", "date": "2010-08-30", "date_type": "published", "publication": "International Journal of Modern Physics B", "volume": "24", "number": "20-21", "publisher": "World Scientific Publishing", "pagerange": "4039-4080", "id_number": "CaltechAUTHORS:20101110-142749026", "issn": "0217-9792", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20101110-142749026", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "David and Lucile Packard Foundation" }, { "agency": "Cottrell Scholar of Research Corporation" }, { "agency": "NSF", "grant_number": "DMR-0906475" }, { "agency": "NSF", "grant_number": "DMR-0705472" } ] }, "collection": "CaltechAUTHORS", "doi": "10.1142/S021797921005644X", "resource_type": "article", "pub_year": "2010", "author_list": "Halperin, Bertrand I.; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/z3hm5-jpz80", "eprint_id": 19804, "eprint_status": "archive", "datestamp": "2023-08-19 03:34:55", "lastmod": "2023-10-20 21:54:44", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pekker-D", "name": { "family": "Pekker", "given": "David" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Demler-E", "name": { "family": "Demler", "given": "Eugene" } } ] }, "title": "Finding the Elusive Sliding Phase in the Superfluid-Normal Phase Transition Smeared by c-Axis Disorder", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society.\n\nReceived 2 April 2010; published 20 August 2010.\n\nIt is our pleasure to thank Michael Lawler, Subir\nSachdev, and Bryan Clark for insightful discussions. D. P.\nand E. D. acknowledge support from DARPA, CUA, and\nNSF Grant No. DMR-07-05472. G.R. gratefully acknowledges\nsupport from the Packard Foundation, the Sloan\nFoundation, and the Cottrell Scholars program.\n\nPublished - Pekker2010p11259Phys_Rev_Lett.pdf
", "abstract": "We consider a stack of weakly Josephson coupled superfluid layers with c-axis disorder in the form of random superfluid stiffnesses and vortex fugacities in each layer as well as random interlayer coupling strengths. In the absence of disorder this system has a 3D XY type superfluid-normal phase transition as a function of temperature. We develop a functional renormalization group to treat the effects of disorder, and demonstrate that the disorder results in the smearing of the superfluid-normal phase transition via the formation of a Griffiths phase. Remarkably, in the Griffiths phase, the emergent power-law distribution of the interlayer couplings gives rise to a sliding Griffiths superfluid, with a finite stiffness in the a-b direction along the layers, and a vanishing stiffness perpendicular to it.", "date": "2010-08-20", "date_type": "published", "publication": "Physical Review Letters", "volume": "105", "number": "8", "publisher": "American Physical Society", "pagerange": "Art. No. 085302", "id_number": "CaltechAUTHORS:20100907-134630540", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100907-134630540", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Defense Advanced Research Projects Agency (DARPA)" }, { "agency": "CUA" }, { "agency": "NSF", "grant_number": "DMR-07-05472" }, { "agency": "Packard Foundation" }, { "agency": "Sloan Foundation" }, { "agency": "Cottrell Scholars program" } ] }, "doi": "10.1103/PhysRevLett.105.085302", "primary_object": { "basename": "Pekker2010p11259Phys_Rev_Lett.pdf", "url": "https://authors.library.caltech.edu/records/z3hm5-jpz80/files/Pekker2010p11259Phys_Rev_Lett.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Pekker, David; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/fk9mk-46v67", "eprint_id": 19322, "eprint_status": "archive", "datestamp": "2023-08-19 03:11:14", "lastmod": "2023-10-20 20:33:17", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Shivamoggi-V", "name": { "family": "Shivamoggi", "given": "V." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Moore-J-E", "name": { "family": "Moore", "given": "J. E." } } ] }, "title": "Majorana fermion chain at the quantum spin Hall edge", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society.\nReceived 3 May 2010; revised manuscript received 27 June 2010; published 15 July 2010.\n\nThe authors thank L. Fu, C. L. Kane, and L. Molenkamp\nfor useful conversations and acknowledge support from NSF\nunder Grant No. DMR-0804413 V.S. and J.E.M. and from\nthe Packard Foundation, The Sloan Foundation, the Research\nCorporation, and DARPA G.R..\n\nPublished - Shivamoggi2010p10829Phys_Rev_B.pdf
", "abstract": "We study a realization of a 1D chain of Majorana bound states at the interfaces between alternating ferromagnetic and superconducting regions at a quantum spin Hall insulator edge. In the limit of well-separated Majoranas, the system can be mapped to the transverse field Ising model. The disordered critical point can be reached by tuning the relative magnitude or phases of the ferromagnetic and superconducting order parameters. We compute the voltage dependence of the tunneling current from a metallic tip into the Majorana chain as a direct probe of the random critical state.", "date": "2010-07-15", "date_type": "published", "publication": "Physical Review B", "volume": "82", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 041405", "id_number": "CaltechAUTHORS:20100806-141508064", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100806-141508064", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "DMR-0804413" }, { "agency": "Packard Foundation" }, { "agency": "Sloan Foundation" }, { "agency": "Research Corporation" }, { "agency": "Defense Advanced Research Projects Agency (DARPA)" } ] }, "doi": "10.1103/PhysRevB.82.041405", "primary_object": { "basename": "Shivamoggi2010p10829Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/fk9mk-46v67/files/Shivamoggi2010p10829Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Shivamoggi, V.; Refael, G.; et el." }, { "id": "https://authors.library.caltech.edu/records/13j7k-kat24", "eprint_id": 18694, "eprint_status": "archive", "datestamp": "2023-08-19 02:34:14", "lastmod": "2023-10-20 16:40:43", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zou-Yue", "name": { "family": "Zou", "given": "Yue" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Stern-A", "name": { "family": "Stern", "given": "Ady" }, "orcid": "0000-0002-9493-268X" }, { "id": "Eisenstein-J-P", "name": { "family": "Eisenstein", "given": "J. P." } } ] }, "title": "Clausius-Clapeyron relations for first-order phase transitions in bilayer quantum Hall systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society. \n\nReceived 26 December 2009; revised 28 April 2010; published 17 May 2010. \n\nIt is a pleasure to acknowledge useful conversations with J. Alicea, A. Champagne, H. Fertig, A. D. K Finck, A. H. MacDonald, G. Murthy, F. von Oppen, E. Rezayi, S. Simon, and I. Spielman. We thank K. Muraki for providing us the experimental data shown in Fig. 1. We are grateful for support from the research corporation, the Packard Foundation, and the Sloan foundation (G.R.), the Israel-U.S. Binational Science Foundation, the Minerva Foundation, Microsoft Station Q (A.S.), and NSF under Grant No. DMR-0552270 (J.P.E.).\n\nPublished - Zou2010p10317Phys_Rev_B.pdf
Submitted - 0912.2351.pdf
", "abstract": "A bilayer system of two-dimensional electron gases in a perpendicular magnetic field exhibits rich phenomena. At total filling factor \u03bd_(tot)=1, as one increases the layer separation, the bilayer system goes from an interlayer-coherent exciton condensed state to an incoherent phase of, most likely, two decoupled composite-fermion Fermi liquids. Many questions still remain as to the nature of the transition between these two phases. Recent experiments have demonstrated that spin plays an important role in this transition. Assuming that there is a direct first-order transition between the spin-polarized interlayer-coherent quantum Hall state and spin partially polarized composite Fermi-liquid state, we calculate the phase boundary (d/l)_c as a function of parallel magnetic field, NMR/heat pulse, temperature, and density imbalance, and compare with experimental results. Remarkably good agreement is found between theory and various experiments.", "date": "2010-05-15", "date_type": "published", "publication": "Physical Review B", "volume": "81", "number": "20", "publisher": "American Physical Society", "pagerange": "Art. No. 205313", "id_number": "CaltechAUTHORS:20100615-143356094", "issn": "0163-1829", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100615-143356094", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Research Corporation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Alfred P. Sloan Foundation" }, { "agency": "Binational Science Foundation (USA-Israel)" }, { "agency": "Minerva Foundation" }, { "agency": "Microsoft Station Q" }, { "agency": "NSF", "grant_number": "DMR-0552270" } ] }, "doi": "10.1103/PhysRevB.81.205313", "primary_object": { "basename": "0912.2351.pdf", "url": "https://authors.library.caltech.edu/records/13j7k-kat24/files/0912.2351.pdf" }, "related_objects": [ { "basename": "Zou2010p10317Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/13j7k-kat24/files/Zou2010p10317Phys_Rev_B.pdf" } ], "resource_type": "article", "pub_year": "2010", "author_list": "Zou, Yue; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/e5qfr-0zp30", "eprint_id": 18697, "eprint_status": "archive", "datestamp": "2023-08-19 02:29:23", "lastmod": "2023-10-20 16:40:54", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Altman-E", "name": { "family": "Altman", "given": "Ehud" } }, { "id": "Kafri-Y", "name": { "family": "Kafri", "given": "Yariv" } }, { "id": "Polkovnikov-A", "name": { "family": "Polkovnikov", "given": "Anatoli" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Superfluid-insulator transition of disordered bosons in one dimension", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society.\n\nReceived 19 November 2009; revised manuscript received 20 April 2010; published 25 May 2010.\n\nWe are most grateful to S. Girvin for the useful suggestion\nto look into the half-integer case first, and to D. S. Fisher,\nM. P. A. Fisher, T. Giamarchi, V. Gurarie, D. Huse, P. Le\nDoussal, O. Motrunich, N. Prokofe'v, and B. Svistunov for\nnumerous discussions. A.P. acknowledges support from\nAFOSR YIP, NSF under Grant No. DMR-0907039, and the\nSloan Foundation. G.R. acknowledges support of the Packard\nFoundation, Sloan Foundation and the Research Corporation.\nE.A. and Y.K. are grateful for support from the ISF.\nThis work also benefited greatly from the BU visitor program\n(Y.K. and G.R.).\n\nPublished - Altman2010p10322Phys_Rev_B.pdf
", "abstract": "We study the superfluid-insulator transition in a one-dimensional system of interacting bosons, modeled as a disordered Josephson array, using a strong-randomness real-space renormalization-group technique. Unlike perturbative methods, this approach does not suffer from run-away flows and allows us to study the complete phase diagram. We show that the superfluid-insulator transition is always Kosterlitz-Thouless like in the way that length and time scales diverge at the critical point. Interestingly however, we find that the transition at strong disorder occurs at a nonuniversal value of the Luttinger parameter, which depends on the disorder strength. This result places the transition in a universality class different from the weak disorder transition first analyzed by Giamarchi and Schulz [Europhys. Lett. 3, 1287 (1987)]. While the details of the disorder potential are unimportant at the critical point, the type of disorder does influence the properties of the insulating phases. We find three classes of insulators which arise for different classes of disorder potential. For disorder only in the charging energies and Josephson coupling constants, at integer filling we find an incompressible but gapless Mott-glass phase. If both integer and half-integer filling factors are allowed then the corresponding phase is a random-singlet insulator, which has a divergent compressibility. Finally in a generic disorder potential the insulator is a Bose glass with a finite compressibility.", "date": "2010-05-01", "date_type": "published", "publication": "Physical Review B", "volume": "81", "number": "17", "publisher": "American Physical Society", "pagerange": "Art. No. 174528", "id_number": "CaltechAUTHORS:20100616-075847387", "issn": "0163-1829", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100616-075847387", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Air Force Office of Scientific Research, Young Investigator Research Program (AFOSR YIP)" }, { "agency": "NSF", "grant_number": "DMR-0907039" }, { "agency": "Sloan Foundation" }, { "agency": "Packard Foundation" }, { "agency": "Research Corporation" }, { "agency": "ISF" }, { "agency": "BU" } ] }, "doi": "10.1103/PhysRevB.81.174528", "primary_object": { "basename": "Altman2010p10322Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/e5qfr-0zp30/files/Altman2010p10322Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Altman, Ehud; Kafri, Yariv; et el." }, { "id": "https://authors.library.caltech.edu/records/38t4y-3gw70", "eprint_id": 18437, "eprint_status": "archive", "datestamp": "2023-08-19 02:09:59", "lastmod": "2023-10-20 16:22:56", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Plamadeala-E", "name": { "family": "Plamadeala", "given": "Eugeniu" } }, { "id": "Pereg-Barnea-T", "name": { "family": "Pereg-Barnea", "given": "T." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Probing order parameter structure in iron-based superconductors using vortices", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2010 The American Physical Society.\n\nReceived 2 December 2009; revised manuscript received 13 March 2010; published 13 April 2010.\nThe authors would like to acknowledge useful discussions\nwith M. Franz, O. Motrunich, and Z. Te\u0161anovi\u0107, the hospitality\nof the Aspen Center for Physics where some of the\nwork has taken place, and funding from the Caltech SURF\nprogram (E.P.); the Packard and Sloan Foundations, the Institute\nfor Quantum Information under NSF Grants No. PHY-\n0456720 and No. PHY-0803371, and the Research Corporation\nCottrell Scholars program (G.R.).\n\nPublished - Plamadeala2010p10060Phys_Rev_B.pdf
", "abstract": "Impurities, inevitably present in all samples, induce elastic transitions between quasiparticle states on the contours of constant energy. These transitions may be seen in Fourier-transformed scanning tunneling spectroscopy experiments, sorted by their momentum transfer. In a superconductor, anomalous scattering in the pairing channel may be introduced by magnetic field. When a magnetic field is applied, vortices act as additional sources of scattering. These additional transitions may enhance or suppress the impurity-induced scattering. We find that the vortex contribution to the transitions is sensitive to the momentum-space structure of the pairing function. In the iron-based superconductors, there are both electron and hole pockets at different regions of the Brillouin zone. Scattering processes therefore represent intrapocket or interpocket transitions, depending on the momentum transfer in the process. In this work we show that while in a simple s-wave superconductor all transitions are enhanced by vortex scattering, in an s_\u00b1 superconductor only intrapocket transitions are affected. We suggest this effect as a probe for the existence of the sign change in the order parameter.", "date": "2010-04-01", "date_type": "published", "publication": "Physical Review B", "volume": "81", "number": "13", "publisher": "American Physical Society", "pagerange": "Art. No. 134513", "id_number": "CaltechAUTHORS:20100525-143325995", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100525-143325995", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Caltech SURF program" }, { "agency": "Packard and Sloan Foundations" }, { "agency": "NSF, Institute for Quantum Information", "grant_number": "PHY-0456720" }, { "agency": "NSF, Institute for Quantum Information", "grant_number": "PHY-0803371" }, { "agency": "Research Corporation Cottrell Scholars program" } ] }, "doi": "10.1103/PhysRevB.81.134513", "primary_object": { "basename": "Plamadeala2010p10060Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/38t4y-3gw70/files/Plamadeala2010p10060Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Plamadeala, Eugeniu; Pereg-Barnea, T.; et el." }, { "id": "https://authors.library.caltech.edu/records/gxtzj-vg078", "eprint_id": 18337, "eprint_status": "archive", "datestamp": "2023-08-19 02:09:42", "lastmod": "2023-10-20 16:07:46", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Barnett-R", "name": { "family": "Barnett", "given": "Ryan" } }, { "id": "Chen-E", "name": { "family": "Chen", "given": "Edward" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Vortex synchronization in Bose\u2013Einstein condensates: a time-dependent Gross\u2013Pitaevskii equation approach", "ispublished": "pub", "full_text_status": "public", "keywords": "Quantum gases, liquids and solids, Statistical physics and nonlinear systems", "note": "\u00a9 2010 IOP Publishing Ltd . Received 25 January 2010. \nPublished 1 April 2010. We thank M Porter and H-P B\u00fcchler for their collaboration in a related previous work. We\nalso thank L Baksmaty for valuable advice on numerical methods. This work was supported\nby the Sherman Fairchild Foundation (RB); the Caltech SURF program (EC); and the Packard\nFoundation, the Sloan Foundation, the Institute for Quantum Information under NSF grants\nPHY-0456720 and PHY-0803371 and the Research Corporation Cottrell Scholars program\n(GR).\n\nPublished - Barnett2010p9859New_J_Phys.pdf
", "abstract": "In this work, we consider vortex lattices in rotating Bose\u2013Einstein condensates composed of two species of bosons having different masses. Previously (Barnett et al 2008 New J. Phys. 10 043030), it was claimed that the vortices of the two species form bound pairs and the two vortex lattices lock. Remarkably, the two condensates and the external drive all rotate at different speeds owing to the disparity of the masses of the constituent bosons. In this paper, we study the system by solving the full two-component Gross\u2013Pitaevskii equations numerically. Using this approach, we verify the stability of the putative locked state that is found to exist within a disc centered on the axis of rotation and that depends on the mass ratio of the two bosons. We also derive a refined estimate for the locking radius tailored to the experimentally relevant case of a harmonic trap and show that this agrees with the numerical results. Finally, we analyze in detail the rotation rates of the different components in the locked and unlocked regimes.", "date": "2010-04-01", "date_type": "published", "publication": "New Journal of Physics", "volume": "12", "number": "4", "publisher": "IOP", "pagerange": "Art. No. 043004", "id_number": "CaltechAUTHORS:20100518-103034288", "issn": "1367-2630", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100518-103034288", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Sherman Fairchild Foundation (RB)" }, { "agency": "Caltech SURF program (EC)" }, { "agency": "Packard Foundation" }, { "agency": "Sloan Foundation" }, { "agency": "Institute for Quantum Information" }, { "agency": "NSF", "grant_number": "PHY-0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371" }, { "agency": "Research Corporation Cottrell Scholars program (GR)" } ] }, "doi": "10.1088/1367-2630/12/4/043004", "primary_object": { "basename": "Barnett2010p9859New_J_Phys.pdf", "url": "https://authors.library.caltech.edu/records/gxtzj-vg078/files/Barnett2010p9859New_J_Phys.pdf" }, "resource_type": "article", "pub_year": "2010", "author_list": "Barnett, Ryan; Chen, Edward; et el." }, { "id": "https://authors.library.caltech.edu/records/j7q3b-04196", "eprint_id": 17239, "eprint_status": "archive", "datestamp": "2023-08-21 23:06:22", "lastmod": "2023-10-19 23:40:53", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Pereg-Barnea-T", "name": { "family": "Pereg-Barnea", "given": "T." } }, { "id": "Weber-H", "name": { "family": "Weber", "given": "H." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Franz-M", "name": { "family": "Franz", "given": "M." } } ] }, "title": "Quantum oscillations from Fermi arcs", "ispublished": "pub", "full_text_status": "restricted", "keywords": "Condensed-matter physics; Quantum physics", "note": "\u00a9 2010 Nature Publishing Group.\n\nReceived 24 April 2009; accepted 15 September 2009;\npublished online 1 November 2009.\n\nThe authors acknowledge discussions with D. Bonn, W. Hardy, B. Seradjeh, L. Taillefer,\nZ. Te\u00b2anovi\u00a2, O. Vafek, M. Vojta and N.-C. Yeh. The work was supported in part by\nNSERC, CIfAR (M.F.), DFG through SFB 608 (H.W.), the Packard Foundation and the\nResearch Corporation (G.R.).\nT.P.B. and H.W. contributed equally to this work. T.P.B. carried out the semiclassical\nanalysis, H.W. carried out the lattice computations and G.R. and M.F. advised.\nThe authors declare no competing financial interests. Supplementary information\naccompanies this paper on www.nature.com/naturephysics. Reprints and permissions\ninformation is available online at http://npg.nature.com/reprintsandpermissions.\nCorrespondence and requests for materials should be addressed to T.P.B.", "abstract": "When a metal is subjected to a strong magnetic field B, nearly all measurable quantities show oscillations periodic in 1/B. Such quantum oscillations represent a canonical probe of the defining aspect of a metal, its Fermi surface. Recent breakthrough experiments demonstrating the existence of unambiguous quantum oscillations in a cuprate superconductor, YBa_(2)Cu_(3)O_(6.51), contradict the well-established result of many angle resolved photoemission studies, which consistently indicate 'Fermi arcs'\u2014truncated segments of a Fermi surface\u2014in the normal state of the cuprates. In this study, with the goal of reconciling the above disagreement, we introduce a mechanism for quantum oscillations that requires only finite segments of a Fermi surface. We show that oscillations periodic in 1/B can occur if the Fermi surface segments are terminated by a pairing gap and present arguments that these oscillations are in fact occurring in the cuprates.", "date": "2010-01", "date_type": "published", "publication": "Nature Physics", "volume": "6", "number": "1", "publisher": "Nature Publishing Group", "pagerange": "44-49", "id_number": "CaltechAUTHORS:20100120-105409610", "issn": "1745-2473", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100120-105409610", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSERC" }, { "agency": "CIfAR" }, { "agency": "DFG", "grant_number": "SFB 608" }, { "agency": "Packard Foundation" }, { "agency": "Research Corporation" } ] }, "doi": "10.1038/nphys1431", "resource_type": "article", "pub_year": "2010", "author_list": "Pereg-Barnea, T.; Weber, H.; et el." }, { "id": "https://authors.library.caltech.edu/records/0xr9b-89881", "eprint_id": 17068, "eprint_status": "archive", "datestamp": "2023-08-19 00:53:19", "lastmod": "2023-10-19 22:46:51", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Moore-J-E", "name": { "family": "Moore", "given": "J. E." } } ] }, "title": "Criticality and entanglement in random quantum systems", "ispublished": "pub", "full_text_status": "restricted", "note": "\u00a9 2009 Institute of Physics and IOP Publishing Limited.\nReceived 9 June 2009, in final form 16 September 2009.\nPublished 2 December 2009.\n\nThe authors would like to thank many collaborators and colleagues for invaluable conversations\nover the past 5 years, and especially thank N Bonesteel, P Calabrese, E Fradkin, L Fidkowski,\nI Klich, H-H Lin, S Mukerjee, F Pollmann, A Silva, P Titum, A Turner and K Yang for their\nentanglement with the authors. The authors gratefully acknowledge financial support from\nthe Packard Foundation, Research Corporation Cottrell award, and the Sloan Foundation, and\nNSF grants PHY-0456720 and PHY-0803371 (GR) and NSF DMR-0804413 (JEM).", "abstract": "We review studies of entanglement entropy in systems with quenched randomness, concentrating on universal behavior at strongly random quantum critical points. The disorder-averaged entanglement entropy provides insight into the quantum criticality of these systems and an understanding of their relationship to non-random ('pure') quantum criticality. The entanglement near many such critical points in one dimension shows a logarithmic divergence in subsystem size, similar to that in the pure case but with a different universal coefficient. Such universal coefficients are examples of universal critical amplitudes in a random system. Possible measurements are reviewed along with the one-particle entanglement scaling at certain Anderson localization transitions. We also comment briefly on higher dimensions and challenges for the future.", "date": "2009-12-18", "date_type": "published", "publication": "Journal of Physics A: Mathematical and General", "volume": "42", "number": "50", "publisher": "IOP", "pagerange": "Art. No. 504010", "id_number": "CaltechAUTHORS:20100105-152508974", "issn": "0305-4470", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100105-152508974", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Packard Foundation, Research Corporation Cottrell award" }, { "agency": "Sloan Foundation" }, { "agency": "NSF", "grant_number": "PHY-0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371 (GR)" }, { "agency": "NSF", "grant_number": "DMR-0804413" } ] }, "doi": "10.1088/1751-8113/42/50/504010", "resource_type": "article", "pub_year": "2009", "author_list": "Refael, G. and Moore, J. E." }, { "id": "https://authors.library.caltech.edu/records/6sbfx-hf809", "eprint_id": 17188, "eprint_status": "archive", "datestamp": "2023-08-19 00:53:24", "lastmod": "2023-10-19 23:37:44", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Alicea-J", "name": { "family": "Alicea", "given": "Jason" }, "orcid": "0000-0001-9979-3423" }, { "id": "Motrunich-O-I", "name": { "family": "Motrunich", "given": "Olexei I." }, "orcid": "0000-0001-8031-0022" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Fisher-Matthew-P-A", "name": { "family": "Fisher", "given": "Matthew P. A." } } ] }, "title": "Interlayer Coherent Composite Fermi Liquid Phase in Quantum Hall Bilayers", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2009 The American Physical Society. \n\nReceived 26 August 2009; published 17 December 2009. \n\nIt is a pleasure to acknowledge illuminating discussions with G. Chen, J. Eisenstein, Y.-B. Kim, D. Luhman, M. Milovanovic, G. Moller, and Y. Zou.We also acknowledge support from the Lee A. DuBridge Foundation (J. A), the A. P. Sloan Foundation (O. I. M), the Packard Foundation (G. R), and the NSF through Grants No. DMR- 0529399 (M. P. A. F), No. PHY-0456720, and No. PHY-0803371 (G. R).\n\nPublished - Alicea2009p6689Phys_Rev_Lett.pdf
", "abstract": "We introduce an interlayer coherent composite Fermi liquid for \u03bd=1/2+1/2 bilayers, in which interlayer Coulomb repulsion drives exciton condensation of composite fermions. As a result, composite fermions propagate coherently between layers\u2014even though electrons do not\u2014and form bonding and antibonding Fermi seas. This phase is compressible with respect to symmetric currents but quantum Hall-like in the counterflow channel. Quantum oscillations of the composite Fermi seas generate a new series of incompressible states at \u03bd=p/[2(p\u00b11)] per layer (p an integer), which is a bilayer analogue of Jain's sequence.", "date": "2009-12-18", "date_type": "published", "publication": "Physical Review Letters", "volume": "103", "number": "25", "publisher": "American Physical Society", "pagerange": "Art. No. 256403", "id_number": "CaltechAUTHORS:20100114-143033701", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100114-143033701", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Lee A. DuBridge Foundation" }, { "agency": "Alfred P. Sloan Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "NSF", "grant_number": "DMR-0529399" }, { "agency": "NSF", "grant_number": "PHY-0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371" } ] }, "doi": "10.1103/PhysRevLett.103.256403", "primary_object": { "basename": "Alicea2009p6689Phys_Rev_Lett.pdf", "url": "https://authors.library.caltech.edu/records/6sbfx-hf809/files/Alicea2009p6689Phys_Rev_Lett.pdf" }, "resource_type": "article", "pub_year": "2009", "author_list": "Alicea, Jason; Motrunich, Olexei I.; et el." }, { "id": "https://authors.library.caltech.edu/records/12m9y-wdv11", "eprint_id": 17031, "eprint_status": "archive", "datestamp": "2023-08-21 22:36:30", "lastmod": "2023-10-19 22:45:05", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zou-Y", "name": { "family": "Zou", "given": "Yue" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Yoon-J", "name": { "family": "Yoon", "given": "Jongsoo" } } ] }, "title": "Investigating the superconductor-insulator transition in thin films using drag resistance: Theoretical analysis of a proposed experiment", "ispublished": "pub", "full_text_status": "public", "keywords": "amorphous state; drag; indium compounds; magnetoresistance; superconducting thin films; superconducting transitions; tantalum", "note": "\u00a9 2009 The American Physical Society.\nReceived 5 August 2009; published 6 November 2009.\nIt is a pleasure to thank Yonatan Dubi, Jim Eisenstein,\nAlexander Finkel'stein, Alex Kamenev, Yen-Hsiang Lin, Yigal\nMeir, Yuval Oreg, Philip Phillips, Ady Stern, Jiansheng\nWu, and Ke Xu for stimulating discussions. This work was\nsupported by the Research Corporation's Cottrell award\nG.R. and by NSF through Grant No. DMR-0239450 J.Y..\n\nPublished - Zou2009p6642Phys_Rev_B.pdf
", "abstract": "The magnetically driven superconductor-insulator transition in amorphous thin films (e.g., InO and Ta) exhibits several mysterious phenomena, such as a putative metallic phase and a huge magnetoresistance peak. Unfortunately, several conflicting categories of theories, particularly quantum-vortex condensation, and normal region percolation, explain key observations equally well. We present a experimental setup, an amorphous thin-film bilayer, where a drag resistance measurement would clarify the role quantum vortices play in the transition, and hence decisively point to the correct picture. We provide a thorough analysis of the device, which shows that the vortex paradigm gives rise to a drag with an opposite sign and orders of magnitude larger than the drag measured if competing paradigms apply.", "date": "2009-11", "date_type": "published", "publication": "Physical Review B", "volume": "80", "number": "18", "publisher": "American Physical Society", "pagerange": "Art. No. 180503", "id_number": "CaltechAUTHORS:20091223-133328679", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20091223-133328679", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Research Corporation's Cottrell" }, { "agency": "NSF", "grant_number": "DMR-0239450" } ] }, "doi": "10.1103/PhysRevB.80.180503", "primary_object": { "basename": "Zou2009p6642Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/12m9y-wdv11/files/Zou2009p6642Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2009", "author_list": "Zou, Yue; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/nvm0q-c4e20", "eprint_id": 16795, "eprint_status": "archive", "datestamp": "2023-08-21 22:26:51", "lastmod": "2023-10-19 22:33:56", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lee-T-E", "name": { "family": "Lee", "given": "Tony E." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Cross-M-C", "name": { "family": "Cross", "given": "M. C." } }, { "id": "Kogan-O", "name": { "family": "Kogan", "given": "Oleg" } }, { "id": "Rogers-J-L", "name": { "family": "Rogers", "given": "Jeffrey L." } } ] }, "title": "Universality in the one-dimensional chain of phase-coupled oscillators", "ispublished": "pub", "full_text_status": "public", "keywords": "critical exponents; oscillators; random processes; renormalisation; synchronisation", "note": "\u00a9 2009 The American Physical Society.\nReceived 16 July 2009; published 21 October 2009.\nThis work was supported by Boeing. G.R. thanks the Research\nCorporation and the Packard foundation for their generous\nsupport. We also thank Heywood Tam for many helpful\ndiscussions.\n\nPublished - Lee2009p6334Phys_Rev_E.pdf
", "abstract": "We apply a recently developed renormalization-group (RG) method to study synchronization in a one-dimensional chain of phase-coupled oscillators in the regime of weak randomness. The RG predicts how oscillators with randomly distributed frequencies and couplings form frequency-synchronized clusters. Although the RG was originally intended for strong randomness, i.e., for distributions with long tails, we find good agreement with numerical simulations even in the regime of weak randomness. We use the RG flow to derive how the correlation length scales with the width of the coupling distribution in the limit of large coupling. This leads to the identification of a universality class of distributions with the same critical exponent v. We also find universal scaling for small coupling. Finally, we show that the RG flow is characterized by a universal approach to the unsynchronized fixed point, which provides physical insight into low-frequency clusters.", "date": "2009-10", "date_type": "published", "publication": "Physical Review E", "volume": "80", "number": "4", "publisher": "American Physical Society", "pagerange": "Art. No. 046210", "id_number": "CaltechAUTHORS:20091124-144207656", "issn": "1539-3755", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20091124-144207656", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Boeing" } ] }, "doi": "10.1103/PhysRevE.80.046210", "primary_object": { "basename": "Lee2009p6334Phys_Rev_E.pdf", "url": "https://authors.library.caltech.edu/records/nvm0q-c4e20/files/Lee2009p6334Phys_Rev_E.pdf" }, "resource_type": "article", "pub_year": "2009", "author_list": "Lee, Tony E.; Refael, G.; et el." }, { "id": "https://authors.library.caltech.edu/records/e1nq2-0fn39", "eprint_id": 16410, "eprint_status": "archive", "datestamp": "2023-08-21 22:12:56", "lastmod": "2023-10-19 22:12:18", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Kogan-O", "name": { "family": "Kogan", "given": "Oleg" } }, { "id": "Rogers-J-L", "name": { "family": "Rogers", "given": "Jeffrey L." } }, { "id": "Cross-M-C", "name": { "family": "Cross", "given": "M. C." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } } ] }, "title": "Renormalization group approach to oscillator synchronization", "ispublished": "pub", "full_text_status": "restricted", "keywords": "nonlinear dynamical systems; oscillators; renormalisation; synchronisation", "note": "\u00a9 2009 The American Physical Society.\nReceived 27 October 2008; published 18 September 2009.\nIt is a pleasure to thank Heywood Tam for numerous discussions\nand Tony Lee for carefully checking the RG procedure.\nWe are also grateful to Boeing and the National Science\nFoundation under Grant No. DMR-0314069 for funding\nthis work.", "abstract": "We develop a renormalization group method to investigate synchronization clusters in a one-dimensional chain of nearest-neighbor coupled phase oscillators. The method is best suited for chains with strong disorder in the intrinsic frequencies and coupling strengths. The results are compared with numerical simulations of the chain dynamics and good agreement in several characteristics is found. We apply the renormalization group and simulations to Lorentzian distributions of intrinsic frequencies and couplings and investigate the statistics of the resultant cluster sizes and frequencies, as well as the dependence of the characteristic cluster length upon parameters of these Lorentzian distributions.", "date": "2009-09", "date_type": "published", "publication": "Physical Review E", "volume": "80", "number": "3", "publisher": "American Physical Society", "pagerange": "Art. No. 036206", "id_number": "CaltechAUTHORS:20091020-134924682", "issn": "1539-3755", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20091020-134924682", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Boeing" }, { "agency": "NSF", "grant_number": "DMR-0314069" } ] }, "doi": "10.1103/PhysRevE.80.036206", "resource_type": "article", "pub_year": "2009", "author_list": "Kogan, Oleg; Rogers, Jeffrey L.; et el." }, { "id": "https://authors.library.caltech.edu/records/yc6xm-mpz93", "eprint_id": 15091, "eprint_status": "archive", "datestamp": "2023-08-21 21:45:53", "lastmod": "2023-10-18 20:30:18", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Barnett-R", "name": { "family": "Barnett", "given": "Ryan" } }, { "id": "Podolsky-D", "name": { "family": "Podolsky", "given": "Daniel" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Geometrical approach to hydrodynamics and low-energy excitations of spinor condensates", "ispublished": "pub", "full_text_status": "public", "keywords": "Bose-Einstein condensation; crystal field interactions; ground states; hydrodynamics; molecular configurations; spin waves; vibrational states; wave functions", "note": "\u00a9 2009 The American Physical Society. \n\nReceived 12 March 2009; revised 10 June 2009; published 21 July 2009. \n\nIt is a pleasure to acknowledge useful conversations with E. Demler, T.-L. Ho, I. Klich, A. Lamacraft, and especially A. Turner. We would like to acknowledge the hospitality of the KITP, supported by NSF under Grant No. PHY05-51164. We are also grateful for support from the Sherman Fairchild Foundation (RB); the Packard and Sloan Foundations, the Institute for Quantum Information under NSF under Grants No. PHY-0456720 and No. PHY-0803371, and The Research Corporation Cottrell Scholars program (GR); and CIFAR, NSERC, and CRC (DP). \n\n05.30.Jp\nBoson systems (quantum statistical mechanics)\n03.75.Hh\nStatic properties of Bose-Einstein condensates\n03.75.Kk\nDynamic properties of Bose-Einstein condensates\n03.75.Mn\nMulticomponent condensates; spinor condensates", "abstract": "In this work, we derive the equations of motion governing the dynamics of spin-F spinor condensates. We pursue a description based on standard physical variables (total density and superfluid velocity), alongside 2F \"spin nodes:\" unit vectors that describe the spin-F state and also exhibit the point-group symmetry of a spinor condensate's mean-field ground state. In the first part of our analysis, we derive the hydrodynamic equations of motion, which consist of a mass continuity equation, 2F Landau-Lifshitz equations for the spin nodes, and a modified Euler equation. In particular, we provide a generalization of the Mermin-Ho relation to spin one and find an analytic solution for the skyrmion texture in the incompressible regime of a spin-half condensate. In the second part, we study the linearized dynamics of spinor condensates. We provide a general method to linearize the equations of motion based on the symmetry of the mean-field ground state using the local stereographic projection of the spin nodes. We also provide a simple construction to extract the collective modes from symmetry considerations alone akin to the analysis of vibrational excitations of polyatomic molecules. Finally, we present a mapping between the spin-wave modes, and the wave functions of electrons in atoms, where the spherical symmetry is degraded by a crystal field. These results demonstrate the beautiful geometrical structure that underlies the dynamics of spinor condensates.", "date": "2009-07-01", "date_type": "published", "publication": "Physical Review B", "volume": "80", "number": "2", "publisher": "American Physical Society", "pagerange": "024420", "id_number": "CaltechAUTHORS:20090817-144813522", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20090817-144813522", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "NSF", "grant_number": "PHY05-51164" }, { "agency": "Sherman Fairchild Foundation" }, { "agency": "David and Lucile Packard Foundation" }, { "agency": "Alfred P. Sloan Foundation" }, { "agency": "NSF", "grant_number": "PHY-0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371" }, { "agency": "Research Corporation" }, { "agency": "Canadian Institute for Advanced Research" }, { "agency": "Natural Sciences and Engineering Research Council of Canada" }, { "agency": "Canada Research Chairs" } ] }, "doi": "10.1103/PhysRevB.80.024420", "resource_type": "article", "pub_year": "2009", "author_list": "Barnett, Ryan; Podolsky, Daniel; et el." }, { "id": "https://authors.library.caltech.edu/records/ps887-yxt27", "eprint_id": 14359, "eprint_status": "archive", "datestamp": "2023-08-20 01:27:20", "lastmod": "2023-10-18 16:48:25", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Fidkowski-L", "name": { "family": "Fidkowski", "given": "L." } }, { "id": "Lin-H-H", "name": { "family": "Lin", "given": "H.-H." } }, { "id": "Titum-P", "name": { "family": "Titum", "given": "P." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } } ] }, "title": "Permutation-symmetric critical phases in disordered non-Abelian anyonic chains", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2009 American Physical Society.\nReceived 22 January 2009; published 27 April 2009.\nWe would like to thank John Preskill and Simon Trebst for useful discussions. Also, we would especially like to thank David Huse for useful discussions during the early part of this work. H.-H.L. and P.T. were supported by the Summer Undergraduate Research Foundation at the California Institute of Technology. L.F. and G.R. would like to acknowledge support from the Institute for Quantum Information under NSF Grants No. PHY-0456720 and No. PHY-\n0803371, and from the Packard Foundation.\nPACS number(s): 75.10.Pq\n\nPublished - Fidkowski2009p2558Phys_Rev_B.pdf
", "abstract": "Topological phases supporting non-Abelian anyonic excitations have been proposed as candidates for topological quantum computation. In this paper, we study disordered non-Abelian anyonic chains based on the quantum groups SU(2)_k, a hierarchy that includes the v = 5/2 fractional quantum Hall state and the proposed v = 12/5 Fibonacci state, among others. We find that for odd k these anyonic chains realize infinite-randomness critical phases in the same universality class as the S_k permutation symmetric multicritical points of Damle and Huse [Phys. Rev. Lett. 89, 277203 (2002)]. Indeed, we show that the pertinent subspace of these anyonic chains actually sits inside the Z_k \u2282 S_k symmetric sector of the Damle-Huse model, and this Z_k symmetry stabilizes the phase.", "date": "2009-04-15", "date_type": "published", "publication": "Physical Review B", "volume": "79", "number": "15", "publisher": "American Physical Society", "pagerange": "Art No. 155120", "id_number": "CaltechAUTHORS:20090603-135244215", "issn": "0163-1829", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20090603-135244215", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Summer Undergraduate Research Foundation, Caltech" }, { "agency": "NSF", "grant_number": "PHY-0456720" }, { "agency": "NSF", "grant_number": "PHY-0803371" }, { "agency": "David and Lucile Packard Foundation" } ] }, "doi": "10.1103/PhysRevB.79.155120", "primary_object": { "basename": "Fidkowski2009p2558Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/ps887-yxt27/files/Fidkowski2009p2558Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2009", "author_list": "Fidkowski, L.; Lin, H.-H.; et el." }, { "id": "https://authors.library.caltech.edu/records/3anek-qfs07", "eprint_id": 14487, "eprint_status": "archive", "datestamp": "2023-08-21 20:54:26", "lastmod": "2023-10-18 18:02:31", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Demler-E", "name": { "family": "Demler", "given": "Eugene" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } } ] }, "title": "Superconductor to normal-metal transition in finite-length nanowires: phenomenological model", "ispublished": "pub", "full_text_status": "public", "keywords": "electrical resistivity; nanowires; superconducting transitions", "note": "\u00a9 2009 The American Physical Society.\nReceived 21 November 2008; published 27 March 2009.\n\nThe authors thank D. S. Fisher, who collaborated with\nthem on much of the reported research. They also thank A.\nBezryadin, A. Bollinger, P. Goldbart, B. I. Halperin, D.\nMeidan, D. Podolsky, and D. Shahar for many helpful discussions.\nG.R. thanks the Technion ITP and the Weizmann\nInstitute for their generous hospitality. Y.O. acknowledges\nsupport of the ISF.\n\nPACS number(s): 74.81.Fa, 74.78.Na.\n\nPublished - Refael2009p1448Phys_Rev_B.pdf
", "abstract": "In this paper we discuss the interplay of quantum fluctuations and dissipation in uniform superconducting nanowires. We consider a phenomenological model with superconducting and normal components and a finite equilibration rate between these two fluids. We find that phase-slip dipoles proliferate in the wire and decouple the two fluids within its bulk. This implies that the normal fluid only couples to the superconductor fluid through the leads at the edges of the wire, and the local dissipation is unimportant. Therefore, while long wires have a superconductor-metal transition tuned by local properties of the superconducting fluid, short wires have a transition when the total resistance is R_(tot)=R_Q=h/4e^2.", "date": "2009-03", "date_type": "published", "publication": "Physical Review B", "volume": "79", "number": "9", "publisher": "American Physical Society", "pagerange": "094524", "id_number": "CaltechAUTHORS:20090702-094821436", "issn": "0163-1829", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20090702-094821436", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Israeli Science Foundation (ISF)" } ] }, "doi": "10.1103/PhysRevB.79.094524", "primary_object": { "basename": "Refael2009p1448Phys_Rev_B.pdf", "url": "https://authors.library.caltech.edu/records/3anek-qfs07/files/Refael2009p1448Phys_Rev_B.pdf" }, "resource_type": "article", "pub_year": "2009", "author_list": "Refael, Gil; Demler, Eugene; et el." }, { "id": "https://authors.library.caltech.edu/records/q0kx7-bw237", "eprint_id": 13866, "eprint_status": "archive", "datestamp": "2023-08-20 00:35:32", "lastmod": "2023-10-18 14:31:37", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "The universal behavior of a disordered system", "ispublished": "pub", "full_text_status": "public", "keywords": "quantum mechanics", "note": "\u00a9 2009 American Physical Society.\nA Viewpoint on:\nInfinite-randomness quantum critical points induced by dissipation\nThomas Vojta, Chetan Kotabage and Jos\u00e9 A. Hoyos\nPhys. Rev. B 79, 024401 (2009) \u2013 Published January 5, 2009.\n\nPublished - REFp09.pdf
", "abstract": "The Landau theory of phase transitions and the concept\nof symmetry breaking provide a unifying description\nof even such seemingly different many-body systems\nas a paramagnet cooled to the verge of ferromagnetic\norder or a metal approaching the superconducting\ntransition. What happens, however, when these systems\ncan lose energy to their environment? For example,\nin rare-earth compounds called \"heavy-fermion\"\nmaterials, the f-shell magnetic moments interact with\na sea of mobile electrons [1]. Similarly, near the metalsuperconductor\ntransition in ultrathin wires, the electrons\npair up in a connected network of small, superconducting\npuddles that are surrounded by a bath of\nunpaired metallic electrons [2]. The surrounding metal\ngives rise to a parallel resistive channel and hence dissipation.\nIntroducing dissipation into a many-body quantum\nmechanical problem presented a theoretical challenge\nthat was only resolved in the last quarter of the\n20th century [3\u20135].", "date": "2009-01", "date_type": "published", "publication": "Physics", "volume": "2", "number": "1", "publisher": "American Physical Society", "pagerange": "1-3", "id_number": "CaltechAUTHORS:20090407-100632110", "issn": "1943-2879", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20090407-100632110", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/Physics.2.1", "primary_object": { "basename": "REFp09.pdf", "url": "https://authors.library.caltech.edu/records/q0kx7-bw237/files/REFp09.pdf" }, "resource_type": "article", "pub_year": "2009", "author_list": "Refael, Gil" }, { "id": "https://authors.library.caltech.edu/records/t5pbw-qwa22", "eprint_id": 12687, "eprint_status": "archive", "datestamp": "2023-08-22 13:46:32", "lastmod": "2023-10-17 20:26:11", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Fidkowski-L", "name": { "family": "Fidkowski", "given": "L." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Bonesteel-N-E", "name": { "family": "Bonesteel", "given": "N. E." } }, { "id": "Moore-J-E", "name": { "family": "Moore", "given": "J. E." } } ] }, "title": "c-theorem violation for effective central charge of infinite-randomness fixed points", "ispublished": "pub", "full_text_status": "public", "keywords": "antiferromagnetism, anyons, entropy, ferromagnetism, Fibonacci sequences, ground states, Heisenberg model, quantum computing, quantum entanglement, renormalization", "note": "\u00a9 2008 The American Physical Society. \n\nReceived 18 August 2008; published 18 December 2008. \n\nWe are indebted to A. Kitaev, J. Preskill, S. Trebst, and P. Bonderson for illuminating discussions. We would like to especially thank K. Yang for his contributions to this project. G.R. and L.F. acknowledge support from NSF under Grant No. PHY-0456720. N.E.B. acknowledges support from U.S. DOE under Grant No. DE-FG02-97ER45639. J.M. acknowledges support from NSF under Grant No. DMR-0238760. We would also like to acknowledge the KITP and UCSB for their hospitality.\n\nPublished - FIDprb08.pdf
", "abstract": "Topological insulators supporting non-Abelian anyonic excitations are in the center of attention as candidates for topological quantum computation. In this paper, we analyze the ground-state properties of disordered non-Abelian anyonic chains. The resemblance of fusion rules of non-Abelian anyons and real-space decimation strongly suggests that disordered chains of such anyons generically exhibit infinite-randomness phases. Concentrating on the disordered golden chain model with nearest-neighbor coupling, we show that Fibonacci anyons with the fusion rule tau[direct-product]tau=1[direct-sum]tau exhibit two infinite-randomness phases: a random-singlet phase when all bonds prefer the trivial fusion channel and a mixed phase which occurs whenever a finite density of bonds prefers the tau fusion channel. Real-space renormalization-group (RG) analysis shows that the random-singlet fixed point is unstable to the mixed fixed point. By analyzing the entanglement entropy of the mixed phase, we find its effective central charge and find that it increases along the RG flow from the random-singlet point, thus ruling out a c theorem for the effective central charge.", "date": "2008-12-01", "date_type": "published", "publication": "Physical Review B", "volume": "78", "number": "22", "publisher": "American Physical Society", "pagerange": "Art. No. 224204", "id_number": "CaltechAUTHORS:FIDprb08", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:FIDprb08", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "National Science Foundation", "grant_number": "PHY-0456720" }, { "agency": "Department of Energy", "grant_number": "DE-FG02-97ER45639" }, { "agency": "National Science Foundation", "grant_number": "DMR-0238760" } ] }, "doi": "10.1103/PhysRevB.78.224204", "primary_object": { "basename": "eds_suggest-prb.gif", "url": "https://authors.library.caltech.edu/records/t5pbw-qwa22/files/eds_suggest-prb.gif" }, "related_objects": [ { "basename": "FIDprb08.pdf", "url": "https://authors.library.caltech.edu/records/t5pbw-qwa22/files/FIDprb08.pdf" } ], "resource_type": "article", "pub_year": "2008", "author_list": "Fidkowski, L.; Refael, G.; et el." }, { "id": "https://authors.library.caltech.edu/records/xdg9q-d2e59", "eprint_id": 12135, "eprint_status": "archive", "datestamp": "2023-08-22 13:25:29", "lastmod": "2023-10-17 16:33:06", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Gurarie-V", "name": { "family": "Gurarie", "given": "V." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Chalker-J-T", "name": { "family": "Chalker", "given": "J. T." } } ] }, "title": "Excitations of One-Dimensional Bose-Einstein Condensates in a Random Potential", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2008 The American Physical Society. \n\n(Received 30 June 2008; published 24 October 2008) \n\nWe acknowledge support from the NSF Grant No. DMR-0449521, the NIST-CU seed grant (V.G.), and the EPSRC Grant No. EP/D050952/1 (J.T.C.).\n\nPublished - GURprl08.pdf
", "abstract": "We examine bosons hopping on a one-dimensional lattice in the presence of a random potential at zero temperature. Bogoliubov excitations of the Bose-Einstein condensate formed under such conditions are localized, with the localization length diverging at low frequency as [script-l](omega)~1/omegaalpha. We show that the well-known result alpha=2 applies only for sufficiently weak random potential. As the random potential is increased beyond a certain strength, alpha starts decreasing. At a critical strength of the potential, when the system of bosons is at the transition from a superfluid to an insulator, alpha=1. This result is relevant for understanding the behavior of the atomic Bose-Einstein condensates in the presence of random potential, and of the disordered Josephson junction arrays.", "date": "2008-10-24", "date_type": "published", "publication": "Physical Review Letters", "volume": "101", "number": "17", "publisher": "American Physical Society", "pagerange": "Art. No. 170407", "id_number": "CaltechAUTHORS:GURprl08", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:GURprl08", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "National Science Foundation", "grant_number": "DMR-0449521" }, { "agency": "National Institute of Standards and Technology" }, { "agency": "Engineering and Physical Sciences Research Council (EPSRC) (UK)", "grant_number": "EP/D050952/1" } ] }, "doi": "10.1103/PhysRevLett.101.170407", "primary_object": { "basename": "GURprl08.pdf", "url": "https://authors.library.caltech.edu/records/xdg9q-d2e59/files/GURprl08.pdf" }, "resource_type": "article", "pub_year": "2008", "author_list": "Gurarie, V.; Refael, G.; et el." }, { "id": "https://authors.library.caltech.edu/records/6q6c4-kgz41", "eprint_id": 11936, "eprint_status": "archive", "datestamp": "2023-08-22 13:21:23", "lastmod": "2023-10-17 15:59:47", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Bishara-W", "name": { "family": "Bishara", "given": "Waheb" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Bockrath-M-W", "name": { "family": "Bockrath", "given": "Marc" } } ] }, "title": "Sagnac interference in carbon nanotubes", "ispublished": "pub", "full_text_status": "public", "keywords": "carbon nanotubes; current fluctuations; electric admittance; Fabry-Perot interferometers; perturbation theory; Sagnac interferometers", "note": "\u00a9 2008 The American Physical Society. \n\n(Received 20 June 2008; revised 17 September 2008; published 6 October 2008) \n\nWe are indebted to Jinseong Hu, Chetan Nayak, Yuval Oreg, Leonid Pryadko, and Jan von Delft for illuminating discussions. M.B. is grateful for support by the ONR.\n\nPublished - BISprb08.pdf
", "abstract": "The Sagnac interference mode arises when two interfering counterpropogating beams traverse a loop, but with their velocities detuned by a small amount 2u, with vR/L=vF\u00b1u. In this paper we perform a perturbative nonequilibrium calculation of Sagnac interference in single-channel wires as well as armchair nanotube loops. We study the dependence of the Sagnac conductance oscillations on temperature and interactions. We find that the Sagnac interference is not destroyed by strong interactions, but becomes weakly dependent on the velocity detuning u. In armchairs nanotubes with typical interaction strength, 0.25<=g<=0.5, we find that the necessary temperature for observing the interference effect, TSAG is also only weakly dependent on the interaction, and is enhanced by a factor of 8 relative to the temperature necessary for observing Fabry-P\u00e9rot interference in the same system, TFP.", "date": "2008-10-15", "date_type": "published", "publication": "Physical Review B", "volume": "78", "number": "16", "publisher": "American Physical Society", "pagerange": "Art. No. 165405", "id_number": "CaltechAUTHORS:BISprb08c", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:BISprb08c", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research" } ] }, "doi": "10.1103/PhysRevB.78.165405", "primary_object": { "basename": "BISprb08.pdf", "url": "https://authors.library.caltech.edu/records/6q6c4-kgz41/files/BISprb08.pdf" }, "resource_type": "article", "pub_year": "2008", "author_list": "Bishara, Waheb; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/41167-bqg55", "eprint_id": 11576, "eprint_status": "archive", "datestamp": "2023-08-22 12:59:49", "lastmod": "2023-10-17 15:08:55", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Lutchyn-R-M", "name": { "family": "Lutchyn", "given": "Roman M." }, "orcid": "0000-0002-0222-9728" }, { "id": "Galitski-V-M", "name": { "family": "Galitski", "given": "Victor M." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Das-Sarma-S", "name": { "family": "Das Sarma", "given": "S." } } ] }, "title": "Dissipation-Driven Quantum Phase Transition in Superconductor-Graphene Systems", "ispublished": "pub", "full_text_status": "public", "note": "\u00a9 2008 The American Physical Society. \n\n(Received 19 June 2008; published 2 September 2008) \n\nWe thank M. Feigel'man, E. Hwang, J. Lau, and S. Tewari for stimulating discussions. V.G. acknowledges the hospitality of Boston University visitors program. This work was supported by U.S.-ONR and NSF-NRI.\n\nPublished - LUTprl08.pdf
Cover Image - eds_suggest.gif
", "abstract": "We show that a system of Josephson junctions coupled via low-resistance tunneling contacts to graphene substrate(s) may effectively operate as a current switching device. The effect is based on the dissipation-driven superconductor-to-insulator quantum phase transition, which happens due to the interplay of the Josephson effect and Coulomb blockade. Coupling to a graphene substrate with gapless excitations further enhances charge fluctuations favoring superconductivity. The effect is shown to scale exponentially with the Fermi energy in graphene, which can be controlled by the gate voltage. We develop a theory that quantitatively describes the quantum phase transition in a two-dimensional Josephson junction array, but it is expected to provide a reliable qualitative description for one-dimensional systems as well.", "date": "2008-09-05", "date_type": "published", "publication": "Physical Review Letters", "volume": "101", "number": "10", "publisher": "American Physical Society", "pagerange": "Art. No. 106402", "id_number": "CaltechAUTHORS:LUTprl08", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:LUTprl08", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "Office of Naval Research (ONR)" }, { "agency": "NSF" } ] }, "doi": "10.1103/PhysRevLett.101.106402", "primary_object": { "basename": "eds_suggest.gif", "url": "https://authors.library.caltech.edu/records/41167-bqg55/files/eds_suggest.gif" }, "related_objects": [ { "basename": "medium.png", "url": "https://authors.library.caltech.edu/records/41167-bqg55/files/medium.png" }, { "basename": "small.png", "url": "https://authors.library.caltech.edu/records/41167-bqg55/files/small.png" }, { "basename": "LUTprl08.pdf", "url": "https://authors.library.caltech.edu/records/41167-bqg55/files/LUTprl08.pdf" } ], "resource_type": "article", "pub_year": "2008", "author_list": "Lutchyn, Roman M.; Galitski, Victor M.; et el." }, { "id": "https://authors.library.caltech.edu/records/1dh1n-yve37", "eprint_id": 10397, "eprint_status": "archive", "datestamp": "2023-08-22 11:42:31", "lastmod": "2023-10-16 22:50:35", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Altman-E", "name": { "family": "Altman", "given": "Ehud" } }, { "id": "Kafri-Y", "name": { "family": "Kafri", "given": "Yariv" } }, { "id": "Polkovnikov-A", "name": { "family": "Polkovnikov", "given": "Anatoli" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Insulating Phases and Superfluid-Insulator Transition of Disordered Boson Chains", "ispublished": "pub", "full_text_status": "public", "note": "\u00a92008 The American Physical Society. \n\n(Received 23 November 2007; revised 28 January 2008; published 1 May 2008) \n\nWe thank S. Girvin for suggesting considering the half-integer case. We also acknowledge T. Giamarchi, P. LeDoussal, O. Motrunich, N. Prokofe'v, and B. Svistunov for numerous discussions. A.P.'s research was supported by AFOSR YIP, Y.K. and G.R. acknowledge Boston University visitors program's hospitality. Y.K. and E.A. \nthank the ISF and BSF for support.", "abstract": "Using a strong disorder real-space renormalization group, we study the phase diagram of a fully disordered chain of interacting bosons. Since this approach does not suffer from runaway flows, it allows a direct study of the insulating phases, not accessible in a weak disorder perturbative treatment. We find that the universal properties of the insulating phase are determined by the details and symmetries of the on-site chemical-potential disorder. Three insulating phases are possible: (i) an incompressible Mott glass with a finite superfluid susceptibility, (ii) a random-singlet glass with diverging compressibility and superfluid susceptibility, (iii) a Bose glass with a finite compressibility but diverging superfluid susceptibility. In addition to characterizing the insulating phases, we show that the superfluid-insulator transition is always described by Kosterlitz-Thouless-like flows.", "date": "2008-05-02", "date_type": "published", "publication": "Physical Review Letters", "volume": "100", "number": "17", "publisher": "American Physical Society", "pagerange": "Art. No. 170402", "id_number": "CaltechAUTHORS:ALTprl08", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:ALTprl08", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevLett.100.170402", "primary_object": { "basename": "ALTprl08.pdf", "url": "https://authors.library.caltech.edu/records/1dh1n-yve37/files/ALTprl08.pdf" }, "resource_type": "article", "pub_year": "2008", "author_list": "Altman, Ehud; Kafri, Yariv; et el." }, { "id": "https://authors.library.caltech.edu/records/2a3s3-jtn25", "eprint_id": 10252, "eprint_status": "archive", "datestamp": "2023-08-22 11:33:47", "lastmod": "2023-10-16 22:45:42", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Barnett-R", "name": { "family": "Barnett", "given": "Ryan" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Porter-M-A", "name": { "family": "Porter", "given": "Mason A." } }, { "id": "B\u00fcchler-H-P", "name": { "family": "B\u00fcchler", "given": "Hans Peter" } } ] }, "title": "Vortex lattice locking in rotating two-component Bose\u2013Einstein condensates", "ispublished": "pub", "full_text_status": "public", "note": "Copyright \u00a9 2008 Deutsche Physikalische Gesellschaft & Institute of Physics. \n\nReceived 24 January 2008. Published 15 April 2008. \n\nWe are grateful for the hospitality of the Kavli Institute for Theoretical Physics where part of this work was completed. We acknowledge support from the Sherman Fairchild Foundation (RB), the Gordon and Betty Moore Foundation through Caltech's Center for the Physics of Information (MAP), and the National Science Foundation under grant no. PHY05-51164 (RB, GR and HPB). We also acknowledge useful discussions with Simon Cornish, Michael Cross, Peter Engels and Erich Mueller.\n\nPublished - BARnjp08.pdf
", "abstract": "The vortex density of a rotating superfluid, divided by its particle mass, dictates the superfluid's angular velocity through the Feynman relation. To find how the Feynman relation applies to superfluid mixtures, we investigate a rotating two-component Bose\u2013Einstein condensate, composed of bosons with different masses. We find that in the case of sufficiently strong interspecies attraction, the vortex lattices of the two condensates lock and rotate at the drive frequency, while the superfluids themselves rotate at two different velocities, whose ratio equals the ratio between the particle masses of the two species. In this paper, we characterize the vortex-locked state, establish its regime of stability, and find that it survives within a disk smaller than a critical radius, beyond which vortices become unbound and the two Bose-gas rings rotate together at the frequency of the external drive.", "date": "2008-04-15", "date_type": "published", "publication": "New Journal of Physics", "volume": "10", "number": "4", "publisher": "IOP", "pagerange": "043030", "id_number": "CaltechAUTHORS:BARnjp08", "issn": "1367-2630", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:BARnjp08", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1088/1367-2630/10/4/043030", "primary_object": { "basename": "BARnjp08.pdf", "url": "https://authors.library.caltech.edu/records/2a3s3-jtn25/files/BARnjp08.pdf" }, "resource_type": "article", "pub_year": "2008", "author_list": "Barnett, Ryan; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/wv3m1-wgd98", "eprint_id": 10340, "eprint_status": "archive", "datestamp": "2023-08-22 11:29:56", "lastmod": "2023-10-16 22:48:47", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Zou-Y", "name": { "family": "Zou", "given": "Yue" } }, { "id": "Klich-I", "name": { "family": "Klich", "given": "Israel" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Effect of inhomogeneous coupling on BCS superconductors", "ispublished": "pub", "full_text_status": "public", "keywords": "BCS theory; coherence length; dirty superconductors; Kosterlitz-Thouless transition; superconducting energy gap; superconducting thin films; superconducting transition temperature", "note": "\u00a92008 The American Physical Society. \n\n(Received 18 December 2007; published 25 April 2008) \n\nWe would like to thank D. Podolsky for several enlightening discussions. The work of I.K. was supported in part by the National Science Foundation under Grant No. PHY05-51164.", "abstract": "We investigate the influence of inhomogeneity in the pairing coupling constant U(r-vector) on dirty BCS superconductors, focusing on Tc, the order parameter Delta(r-vector), and the energy gap Eg(r-vector). Within mean-field theory, we find that when the length scale of the inhomogeneity is comparable to or larger than the coherence length, the ratio 2Eg/Tc is significantly reduced from that of a homogeneous superconductor, while in the opposite limit, this ratio stays unmodified. In two dimensions, when strong phase fluctuations are included, the Kosterlitz-Thouless temperature TKT is also studied. We find that when the inhomogeneity length scale is much larger than the coherence length, 2Eg/TKT can be larger than the usual BCS value. We use our results to qualitatively explain recent experimental observation of a surprisingly low value of 2Eg/Tc in thin films.", "date": "2008-04-01", "date_type": "published", "publication": "Physical Review B", "volume": "77", "number": "14", "publisher": "Physical Review B", "pagerange": "Art. No. 144523", "id_number": "CaltechAUTHORS:ZOUprb08", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:ZOUprb08", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.77.144523", "primary_object": { "basename": "ZOUprb08.pdf", "url": "https://authors.library.caltech.edu/records/wv3m1-wgd98/files/ZOUprb08.pdf" }, "related_objects": [ { "basename": "eds_suggest-prb.gif", "url": "https://authors.library.caltech.edu/records/wv3m1-wgd98/files/eds_suggest-prb.gif" } ], "resource_type": "article", "pub_year": "2008", "author_list": "Zou, Yue; Klich, Israel; et el." }, { "id": "https://authors.library.caltech.edu/records/vxcd5-7cf66", "eprint_id": 10085, "eprint_status": "archive", "datestamp": "2023-08-22 11:29:38", "lastmod": "2023-10-16 22:39:53", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Demler-E", "name": { "family": "Demler", "given": "E." } } ] }, "title": "Superfluid-insulator transition in Fermi-Bose mixtures and the orthogonality catastrophe", "ispublished": "pub", "full_text_status": "public", "keywords": "boson systems; fermion systems; superfluidity", "note": "\u00a92008 The American Physical Society. \n\n(Received 21 December 2007; revised 29 February 2008; published 10 April 2008) \n\nWe gratefully acknowledge useful discussions with E. Altman, H.P. B\u00fcchler, I. Bloch, T. Esslinger, W. Hofstetter, M. Inguscio, W. Ketterle, and R. Sensarma. This work was supported by AFOSR, DARPA, Harvard-MIT CUA, and the NSF Grant No. DMR-0705472.", "abstract": "The superfluid-insulator transition of bosons is strongly modified by the presence of fermions. Through an imaginary-time path-integral approach, we derive the self-consistent mean-field transition line, and account for both the static and dynamic screening effects of the fermions. We find that an effect akin to the fermionic orthogonality catastrophe, arising from the fermionic screening fluctuations, suppresses superfluidity. We analyze this effect for various mixture parameters and temperatures, and consider possible signatures of the orthogonality-catastrophe effect in other measurables of the mixture.", "date": "2008-04-01", "date_type": "published", "publication": "Physical Review B", "volume": "77", "number": "14", "publisher": "Physical Review B", "pagerange": "Art. No. 144511", "id_number": "CaltechAUTHORS:REFprb08", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprb08", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.77.144511", "primary_object": { "basename": "REFprb08.pdf", "url": "https://authors.library.caltech.edu/records/vxcd5-7cf66/files/REFprb08.pdf" }, "related_objects": [ { "basename": "eds_suggest-prb.gif", "url": "https://authors.library.caltech.edu/records/vxcd5-7cf66/files/eds_suggest-prb.gif" } ], "resource_type": "article", "pub_year": "2008", "author_list": "Refael, G. and Demler, E." }, { "id": "https://authors.library.caltech.edu/records/2s378-baz28", "eprint_id": 16362, "eprint_status": "archive", "datestamp": "2023-08-22 11:09:08", "lastmod": "2023-10-19 22:08:46", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Meidan-D", "name": { "family": "Meidan", "given": "Dganit" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Smith-R-A", "name": { "family": "Smith", "given": "Robert A." } } ] }, "title": "Sharp Superconductor-Insulator Transition in Short Wires", "ispublished": "pub", "full_text_status": "restricted", "keywords": "Fluctuations; Superconducting wires; Phase slips", "note": "\u00a9 2007 Elsevier.\n\nAccepted 17 September 2007; available online 6 November 2007. \n\nWe thank E. Demler, and P. Werner. Special thanks to A. Bezryadin for making his data available to us. This study was supported by a DIP grant and by an ISF grant.", "abstract": "Recent experiments on short MoGe nanowires show a sharp superconductor\u2013insulator transition tuned by the normal state resistance of the wire, with a critical resistance of R_c \u2248 R_Q = h/(4e^2). These results are at odds with a broad range of theoretical work on Josephson-like systems that predicts a smooth transition, tuned by the value of the resistance that shunts the junction. We develop a self-consistent renormalization group treatment of interacting phase-slips and their dual counterparts, correlated cooper pair tunneling, beyond the dilute approximation. This analysis leads to a very sharp transition with a critical resistance of R_Q. The addition of the quasi-particles' resistance at finite temperature leads to a quantitative agreement with the experimental results. This self-consistent renormalization group method should also be applicable to other physical systems that can be mapped onto similar sine-Gordon models, in the previously inaccessible intermediate-coupling regime.", "date": "2008-02-15", "date_type": "published", "publication": "Physica C: Superconductivity", "volume": "468", "number": "4", "publisher": "Elsevier", "pagerange": "341-349", "id_number": "CaltechAUTHORS:20091016-111619225", "issn": "0921-4534", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20091016-111619225", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "DIP" }, { "agency": "Israel Science Foundation (ISF)" } ] }, "doi": "10.1016/j.physc.2007.09.019", "resource_type": "article", "pub_year": "2008", "author_list": "Meidan, Dganit; Oreg, Yuval; et el." }, { "id": "https://authors.library.caltech.edu/records/x4dsx-a3s64", "eprint_id": 19158, "eprint_status": "archive", "datestamp": "2023-08-22 11:09:16", "lastmod": "2023-10-20 19:24:55", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Meidan-D", "name": { "family": "Meidan", "given": "Dganit" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Smith-R-A", "name": { "family": "Smith", "given": "Robert A." } } ] }, "title": "Sharp superconductor\u2013insulator transition in short wires", "ispublished": "pub", "full_text_status": "restricted", "keywords": "Fluctuations; Superconducting wires; Phase slips", "note": "\u00a9 2007 Elsevier.\n\nAccepted 17 September 2007; Available online 6 November 2007.\n\nWe thank E. Demler and P. Werner. Special thanks to\nA. Bezryadin for making his data available to us. This\nstudy was supported by a DIP grant and by an ISF grant.", "abstract": "Recent experiments on short MoGe nanowires show a sharp superconductor\u2013insulator transition tuned by the normal state resistance of the wire, with a critical resistance of R_c \u2248 R_Q = h/(4e^2). These results are at odds with a broad range of theoretical work on Josephson-like systems that predicts a smooth transition, tuned by the value of the resistance that shunts the junction. We develop a self-consistent renormalization group treatment of interacting phase-slips and their dual counterparts, correlated cooper pair tunneling, beyond the dilute approximation. This analysis leads to a very sharp transition with a critical resistance of R_Q. The addition of the quasi-particles' resistance at finite temperature leads to a quantitative agreement with the experimental results. This self-consistent renormalization group method should also be applicable to other physical systems that can be mapped onto similar sine-Gordon models, in the previously inaccessible intermediate-coupling regime.", "date": "2008-02-15", "date_type": "published", "publication": "Physica C", "volume": "468", "number": "4", "publisher": "Elsevier", "pagerange": "341-349", "id_number": "CaltechAUTHORS:20100722-100915751", "issn": "0921-4534", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:20100722-100915751", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "funders": { "items": [ { "agency": "DIP (Deutsch-Israelische Projektkooperation, Deutsche Forschungsgemeinschaft)" }, { "agency": "ISF (Israel Science Foundation)" } ] }, "doi": "10.1016/j.physc.2007.09.019", "resource_type": "article", "pub_year": "2008", "author_list": "Meidan, Dganit; Oreg, Yuval; et el." }, { "id": "https://authors.library.caltech.edu/records/2fcss-f5f91", "eprint_id": 9195, "eprint_status": "archive", "datestamp": "2023-08-22 10:28:20", "lastmod": "2023-10-16 21:57:49", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Klich-I", "name": { "family": "Klich", "given": "I." } }, { "id": "Lannert-C", "name": { "family": "Lannert", "given": "C." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } } ] }, "title": "Supercurrent Survival under a Rosen-Zener Quench of Hard-Core Bosons", "ispublished": "pub", "full_text_status": "public", "note": "\u00a92007 The American Physical Society. \n\n(Received 29 June 2007; published 16 November 2007) \n\nWe would like to thank R. Santachiara and S. Powell for discussions.", "abstract": "We study the survival of supercurrents in a system of impenetrable bosons on a lattice, subject to a quantum quench from its critical superfluid phase to an insulating phase. We show that the evolution of the current when the quench follows a Rosen-Zener profile is exactly solvable. This allows us to analyze a quench of arbitrary rate, from a sudden destruction of the superfluid to a slow opening of a gap. The decay and oscillations of the current are analytically derived and studied numerically along with the momentum distribution after the quench. In the case of small supercurrent boosts nu, we find that the current surviving at long times is proportional to nu^3.", "date": "2007-11-16", "date_type": "published", "publication": "Physical Review Letters", "volume": "99", "number": "20", "publisher": "American Physical Society", "pagerange": "Art. No. 205303", "id_number": "CaltechAUTHORS:KLIprl07", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:KLIprl07", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevLett.99.205303", "primary_object": { "basename": "KLIprl07.pdf", "url": "https://authors.library.caltech.edu/records/2fcss-f5f91/files/KLIprl07.pdf" }, "resource_type": "article", "pub_year": "2007", "author_list": "Klich, I.; Lannert, C.; et el." }, { "id": "https://authors.library.caltech.edu/records/s6hv2-4yj60", "eprint_id": 9014, "eprint_status": "archive", "datestamp": "2023-08-22 10:16:00", "lastmod": "2023-10-16 21:52:04", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Fiete-G-A", "name": { "family": "Fiete", "given": "Gregory A." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Fisher-Matthew-P-A", "name": { "family": "Fisher", "given": "Matthew P. A." } } ] }, "title": "Universal Periods in Quantum Hall Droplets", "ispublished": "pub", "full_text_status": "public", "note": "\u00a92007 The American Physical Society. \n\n(Received 18 May 2007; published 18 October 2007) \n\nWe thank Jim Eisenstein, Bernd Rosenow, and Xiao-Gang Wen for enlightening discussions. Financial support from NSF Grants Nos. PHY05-51164 and DMR05-29399 is gratefully acknowledged. G.A.F. was also supported by the Lee A. DuBridge Foundation and M.P.A.F. by the Moore Foundation.", "abstract": "Using the hierarchy picture of the fractional quantum Hall effect, we study the ground-state periodicity of a finite size quantum Hall droplet in a quantum Hall fluid of a different filling factor. The droplet edge charge is periodically modulated with flux through the droplet and will lead to a periodic variation in the conductance of a nearby point contact, such as occurs in some quantum Hall interferometers. Our model is consistent with experiment and predicts that superperiods can be observed in geometries where no interfering trajectories occur. The model may also provide an experimentally feasible method of detecting elusive neutral modes and otherwise obtaining information about the microscopic edge structure in fractional quantum Hall states.", "date": "2007-10-19", "date_type": "published", "publication": "Physical Review Letters", "volume": "99", "number": "16", "publisher": "American Physical Society", "pagerange": "Art. No. 166805", "id_number": "CaltechAUTHORS:FIEprl07", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:FIEprl07", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevLett.99.166805", "primary_object": { "basename": "FIEprl07.pdf", "url": "https://authors.library.caltech.edu/records/s6hv2-4yj60/files/FIEprl07.pdf" }, "resource_type": "article", "pub_year": "2007", "author_list": "Fiete, Gregory A.; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/gyt2t-k8y94", "eprint_id": 8927, "eprint_status": "archive", "datestamp": "2023-08-22 10:05:51", "lastmod": "2023-10-16 21:49:03", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Cherng-R-W", "name": { "family": "Cherng", "given": "R. W." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Demler-E", "name": { "family": "Demler", "given": "E." } } ] }, "title": "Superfluidity and Magnetism in Multicomponent Ultracold Fermions", "ispublished": "pub", "full_text_status": "public", "note": "\u00a92007 The American Physical Society. \n\n(Received 2 May 2007; published 28 September 2007) \n\nWe acknowledge useful discussions with Walter Hofstetter. This work was supported by NSF grant No. DMR-0132874, Harvard-MIT CUA, AFOSR, and NDSEG.", "abstract": "We study the interplay between superfluidity and magnetism in a multicomponent gas of ultracold fermions. Ward-Takahashi identities constrain possible mean-field states describing order parameters for both pairing and magnetization. The structure of global phase diagrams arises from competition among these states as functions of anisotropies in chemical potential, density, or interactions. They exhibit first and second order phase transition as well as multicritical points, metastability regions, and phase separation. We comment on experimental signatures in ultracold atoms.", "date": "2007-09-28", "date_type": "published", "publication": "Physical Review Letters", "volume": "99", "number": "13", "publisher": "American Physical Society", "pagerange": "Art. No. 130406", "id_number": "CaltechAUTHORS:CHEprl07", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:CHEprl07", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevLett.99.130406", "primary_object": { "basename": "CHEprl07.pdf", "url": "https://authors.library.caltech.edu/records/gyt2t-k8y94/files/CHEprl07.pdf" }, "resource_type": "article", "pub_year": "2007", "author_list": "Cherng, R. W.; Refael, G.; et el." }, { "id": "https://authors.library.caltech.edu/records/y7bpy-fss78", "eprint_id": 8453, "eprint_status": "archive", "datestamp": "2023-08-22 09:27:42", "lastmod": "2023-10-16 21:29:20", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Moore-J-E", "name": { "family": "Moore", "given": "J. E." } } ] }, "title": "Entanglement entropy of the random s=1 Heisenberg chain", "ispublished": "pub", "full_text_status": "public", "keywords": "Heisenberg model; critical points; quantum entanglement; entropy; random processes", "note": "\u00a92007 The American Physical Society \n\n(Received 14 March 2007; published 13 July 2007) \n\nThe authors gratefully acknowledge useful conversations with A. Kitaev, I. Klich, A.W.W. Ludwig, J. Preskill, and R. Santachiara, the hospitality of the Kavli Institute for Theoretical Physics, and support from NSF Grants Nos. PHY05-51164, PHY99-07949, and DMR-0238760.", "abstract": "Random spin chains at quantum critical points exhibit an entanglement entropy between a segment of length L and the rest of the chain that scales as log2 L with a universal coefficient. Since for pure quantum critical spin chains this coefficient is fixed by the central charge of the associated conformal field theory, the universal coefficient in the random case can be understood as an effective central charge. In this paper we calculate the entanglement entropy and effective central charge of the spin-1 random Heisenberg model in its random-singlet phase and also at the critical point at which the Haldane phase breaks down. The latter is the first entanglement calculation for an infinite-randomness fixed point that is not in the random-singlet universality class. Our results are consistent with a c-theorem for flow between infinite-randomness fixed points. The formalism we use can be generally applied to calculation of quantities that depend on the RG history in s>=1 random Heisenberg chains.", "date": "2007-07-01", "date_type": "published", "publication": "Physical Review B", "volume": "76", "number": "2", "publisher": "American Physical Society", "pagerange": "Art. No. 024419", "id_number": "CaltechAUTHORS:REFprb07c", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprb07c", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.76.024419", "primary_object": { "basename": "REFprb07b.pdf", "url": "https://authors.library.caltech.edu/records/y7bpy-fss78/files/REFprb07b.pdf" }, "resource_type": "article", "pub_year": "2007", "author_list": "Refael, G. and Moore, J. E." }, { "id": "https://authors.library.caltech.edu/records/x1r3k-64t56", "eprint_id": 8454, "eprint_status": "archive", "datestamp": "2023-08-22 09:19:50", "lastmod": "2023-10-16 21:29:22", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Heo-J", "name": { "family": "Heo", "given": "Jinseong" } }, { "id": "Bockrath-M-W", "name": { "family": "Bockrath", "given": "Marc" } } ] }, "title": "Sagnac Interference in Carbon Nanotube Loops", "ispublished": "pub", "full_text_status": "public", "note": "\u00a92007 The American Physical Society \n\n(Received 22 August 2006; published 15 June 2007) \n\nWe are grateful to J. von Delft and Y. Oreg for a critical discussion, and to L. Balents, E. Demler, D. Feldman, V. Galitski, and J. Meyer for helpful comments. This research was supported in part by the National Science Foundation under Grant No. PHY05-51164.M.B. and J.H. are grateful to support by the ONR.", "abstract": "In this Letter we study electron interference in nanotube loops. The conductance as a function of the applied voltage is shown to oscillate due to interference between electron beams traversing the loop in two opposite directions, with slightly different velocities. The period of these oscillations with respect to the gate voltage, as well as the temperatures required for the effect to appear, are shown to be much larger than those of the related Fabry-Perot interference. We calculate interaction effects on the period of the oscillations, and show that even though interactions destroy much of the near degeneracy of velocities in the symmetric spin channel, the slow interference effects survive.", "date": "2007-06-15", "date_type": "published", "publication": "Physical Review Letters", "volume": "98", "number": "24", "publisher": "American Physical Society", "pagerange": "Art. No. 246803", "id_number": "CaltechAUTHORS:REFprl07b", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprl07b", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevLett.98.246803", "primary_object": { "basename": "REFprl07b.pdf", "url": "https://authors.library.caltech.edu/records/x1r3k-64t56/files/REFprl07b.pdf" }, "resource_type": "article", "pub_year": "2007", "author_list": "Refael, Gil; Heo, Jinseong; et el." }, { "id": "https://authors.library.caltech.edu/records/vt8hw-cnc38", "eprint_id": 8288, "eprint_status": "archive", "datestamp": "2023-08-22 09:02:06", "lastmod": "2023-10-16 21:27:18", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Meidan-D", "name": { "family": "Meidan", "given": "Dganit" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Sharp Superconductor-Insulator Transition in Short Wires", "ispublished": "pub", "full_text_status": "public", "keywords": "Quantum wires", "note": "\u00a92007 The American Physical Society \n\n(Received 28 November 2006; published 1 May 2007) \n\nWe thank E. Demler, R.A. Smith, and P. Werner. Special thanks to A. Bezryadin for making his data available to us. This study was supported by a DIP H.2.1 grant.", "abstract": "Recent experiments on short MoGe nanowires show a sharp superconducting-insulating transition at the universal resistance RQ=h/(4e^2), contrary to the expectation of a smooth temperature dependence of the resistance for such Josephson-like systems. We present a self-consistent renormalization-group treatment of interacting quantum phase slips in short superconducting wires, which reproduces this sharp universal transition. Our method should also apply to other systems in the sine-Gordon universality class, in the previously inaccessible intermediate-coupling regime.", "date": "2007-05-04", "date_type": "published", "publication": "Physical Review Letters", "volume": "98", "number": "18", "publisher": "American Physical Society", "pagerange": "Art. No. 187001", "id_number": "CaltechAUTHORS:MEIprl07", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:MEIprl07", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevLett.98.187001", "primary_object": { "basename": "MEIprl07.pdf", "url": "https://authors.library.caltech.edu/records/vt8hw-cnc38/files/MEIprl07.pdf" }, "resource_type": "article", "pub_year": "2007", "author_list": "Meidan, Dganit; Oreg, Yuval; et el." }, { "id": "https://authors.library.caltech.edu/records/dzq5w-bd547", "eprint_id": 7223, "eprint_status": "archive", "datestamp": "2023-08-22 08:04:32", "lastmod": "2023-10-16 20:47:00", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Demler-E", "name": { "family": "Demler", "given": "Eugene" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Fisher-D-S", "name": { "family": "Fisher", "given": "Daniel S." } } ] }, "title": "Superconductor-to-normal transitions in dissipative chains of mesoscopic grains and nanowires", "ispublished": "pub", "full_text_status": "public", "keywords": "superconducting transitions; mesoscopic systems; nanowires; superconducting junction devices; fluctuations in superconductors; critical exponents; phase diagrams; renormalisation; electrical resistivity", "note": "\u00a92007 The American Physical Society. \n\n(Received 27 December 2005; revised 10 November 2006; published 18 January 2007) \n\nIt is a pleasure to thank A. Bezryadin, M.P.A. Fisher, J. Free, B.I. Halperin, A. Kapitulnik, S. Kivelson, W. Neils, M. Tinkham, S. Sachdev, D. Shahar, and G. Zarand for useful discussions. This work has been supported in part by the NSF via Grants No. DMR-0229243 (D.S.F.) and No. DMR-0132874 (E.D.), and by the Israel-U.S. BSF and an Alona grant (Y.O.).", "abstract": "The interplay of quantum fluctuations and dissipation in chains of mesoscopic superconducting grains is analyzed and the results are applied to nanowires. It is shown that in one dimensional arrays of resistively shunted Josephson junctions, the superconducting-normal charge relaxation within the grains plays an important role. At zero temperature, two superconducting phases can exist, depending primarily on the strength of the dissipation. In the fully superconducting phase (FSC), each grain acts superconducting, and the coupling to the dissipative conduction is important. In the SC[small star, filled] phase, the dissipation is irrelevant at long wavelengths. The transition between these two phases is driven by quantum phase slip dipoles, and is primarily local, with continuously varying critical exponents. In contrast, the transition from the SC[small star, filled] phase to the normal metallic phase is a Kosterlitz-Thouless transition with global character (i.e., determined by the field behavior at large wavelengths). Most interesting is the transition from the FSC phase directly to the normal phase: this transition, which has mixed local and global characteristics, can be one of three distinct types. The corresponding segments of the phase boundary come together at bicritical points. The zero-temperature phase diagram, as well as the finite-temperature scaling behavior are inferred from both weak and strong coupling renormalization group analyses. At intermediate temperatures, near either superconductor-to-normal phase transition, there are regimes of super-metallic behavior, in which the resistivity first decreases gradually with decreasing temperature before eventually increasing as temperature is lowered further. The results on chains of Josephson junctions are extended to continuous superconducting nanowires and the subtle issue of whether these can exhibit an FSC phase is considered. Potential relevance to superconductor-metal transitions in other systems is also discussed.", "date": "2007-01-01", "date_type": "published", "publication": "Physical Review B", "volume": "75", "number": "1", "publisher": "Physical Review B", "pagerange": "Art. No. 014522", "id_number": "CaltechAUTHORS:REFprb07", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprb07", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.75.014522", "primary_object": { "basename": "REFprb07.pdf", "url": "https://authors.library.caltech.edu/records/dzq5w-bd547/files/REFprb07.pdf" }, "resource_type": "article", "pub_year": "2007", "author_list": "Refael, Gil; Demler, Eugene; et el." }, { "id": "https://authors.library.caltech.edu/records/6v71z-w0s45", "eprint_id": 6384, "eprint_status": "archive", "datestamp": "2023-08-22 07:09:52", "lastmod": "2023-10-16 20:18:16", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Hofstetter-W", "name": { "family": "Hofstetter", "given": "Walter" } }, { "id": "Nelson-D-R", "name": { "family": "Nelson", "given": "David R." } } ] }, "title": "Transverse Meissner physics of planar superconductors with columnar pins", "ispublished": "pub", "full_text_status": "public", "keywords": "Meissner effect; flux-line lattice; statistical mechanics; flux pinning; superconducting transitions; Hermitian matrices; renormalisation; tight-binding calculations", "note": "\u00a92006 The American Physical Society \n\n(Received 5 June 2006; revised 9 October 2006; published 29 November 2006) \n\nD.R.N. would like to thank I. Affleck for discussions on torque measurements. D.R.N. was supported by the National Science Foundation through Grant No. DMR-0231631 and through the Harvard Materials Research Science and Engineering Laboratory via Grant No. DMR-0213805. G.R. would like to thank the generous hospitality of the Kavli Institute of Theoretical Physics, UCSB, and of the Boston University visitors program.", "abstract": "The statistical mechanics of thermally excited vortex lines with columnar defects can be mapped onto the physics of interacting quantum particles with quenched random disorder in one less dimension. The destruction of the Bose glass phase in type-II superconductors, when the external magnetic field is tilted sufficiently far from the column direction, is described by a poorly understood non-Hermitian quantum phase transition. We present here exact results for this transition in (1+1) dimensions, obtained by mapping the problem in the hard core limit onto one-dimensional fermions described by a non-Hermitian tight binding model. Both site randomness and the relatively unexplored case of bond randomness are considered. Analysis near the mobility edge and near the band center in the latter case is facilitated by a real space renormalization group procedure used previously for Hermitian quantum problems with quenched randomness in one dimension.", "date": "2006-11-01", "date_type": "published", "publication": "Physical Review B", "volume": "74", "number": "17", "publisher": "Physical Review B", "pagerange": "Art. No. 174520", "id_number": "CaltechAUTHORS:REFprb06", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprb06", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.74.174520", "primary_object": { "basename": "REFprb06.pdf", "url": "https://authors.library.caltech.edu/records/6v71z-w0s45/files/REFprb06.pdf" }, "resource_type": "article", "pub_year": "2006", "author_list": "Refael, Gil; Hofstetter, Walter; et el." }, { "id": "https://authors.library.caltech.edu/records/14krm-scz52", "eprint_id": 6039, "eprint_status": "archive", "datestamp": "2023-08-22 06:27:33", "lastmod": "2023-10-16 20:02:30", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Klich-I", "name": { "family": "Klich", "given": "Israel" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Silva-A", "name": { "family": "Silva", "given": "Alessandro" } } ] }, "title": "Measuring entanglement entropies in many-body systems", "ispublished": "pub", "full_text_status": "public", "keywords": "quantum entanglement; Bose-Einstein condensation; many-body problems; statistical distributions; X-Y model; entropy; wave functions", "note": "\u00a92006 The American Physical Society \n\n(Received 28 February 2006; published 11 September 2006) \n\nWe thank J. Preskill, L. B. Ioffe, and G. Levin for discussions.", "abstract": "We explore the relation between entanglement entropy of quantum many-body systems and the distribution of corresponding, properly selected, observables. Such a relation is necessary to actually measure the entanglement entropy. We show that, in general, the Shannon entropy of the probability distribution of certain symmetry observables gives a lower bound to the entropy. In some cases this bound is saturated and directly gives the entropy. We also show other cases in which the probability distribution contains enough information to extract the entropy: we show how this is done in several examples including BEC wave functions, the Dicke model, XY spin chain, and chains with strong randomness.", "date": "2006-09-01", "date_type": "published", "publication": "Physical Review A", "volume": "74", "number": "3", "publisher": "Physical Review A", "pagerange": "Art. No. 032306", "id_number": "CaltechAUTHORS:KLIpra06", "issn": "1050-2947", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:KLIpra06", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevA.74.032306", "primary_object": { "basename": "KLIpra06.pdf", "url": "https://authors.library.caltech.edu/records/14krm-scz52/files/KLIpra06.pdf" }, "resource_type": "article", "pub_year": "2006", "author_list": "Klich, Israel; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/qkerg-zct30", "eprint_id": 5338, "eprint_status": "archive", "datestamp": "2023-08-22 05:29:54", "lastmod": "2023-10-16 19:10:05", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Hermele-M", "name": { "family": "Hermele", "given": "Michael" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Fisher-Matthew-P-A", "name": { "family": "Fisher", "given": "Matthew P. A." } }, { "id": "Goldbart-P-M", "name": { "family": "Goldbart", "given": "Paul M." } } ] }, "title": "Universal point contact resistance between thin-film superconductors", "ispublished": "pub", "full_text_status": "public", "keywords": "superconducting thin films; Josephson effect; superconducting transition temperature; contact resistance; fluctuations in superconductors", "note": "\u00a92006 The American Physical Society. \n\nReceived 10 November 2005; published 4 April 2006. \n\nWe are grateful to Leon Balents, Alexey Bezryadin, Arun Paramekanti, and Xiao-Gang Wen for useful discussions. This research was supported by the Department of Defense NDSEG program (M.H.); NSF Grant No. PHY99-07949 (G.R. and M.P.A.F.); NSF Grant No. DMR-0210790 (M.P.A.F.); and the U.S. Department of Energy, Division of Material Sciences under Grant No. DEFG02-91ER45439 (through the Frederick Seitz Materials Research Laboratory at UIUC) (P.M.G.).", "abstract": "A system comprising two superconducting thin films connected by a point contact is considered. The contact resistance is calculated as a function of temperature and film geometry, and is found to vanish rapidly with temperature, according to a universal, nearly activated form, becoming strictly zero only at zero temperature. At the lowest temperatures, the activation barrier is set primarily by the superfluid stiffness in the films, and displays only a weak (i.e., logarithmic) temperature dependence. The Josephson effect is thus destroyed, albeit only weakly, as a consequence of the power-law-correlated superconducting fluctuations present in the films below the Berezinskii-Kosterlitz-Thouless transition temperature. The behavior of the resistance is discussed, both in various limiting regimes and as it crosses over between these regimes. Details are presented of a minimal model of the films and the contact, and of the calculation of the resistance. A formulation in terms of quantum phase-slip events is employed, which is natural and effective in the limit of a good contact. However, it is also shown to be effective even when the contact is poor and is, indeed, indispensable, as the system always behaves as if it were in the good-contact limit at low enough temperature. A simple mechanical analogy is introduced to provide some heuristic understanding of the nearly activated temperature dependence of the resistance. Prospects for experimental tests of the predicted behavior are discussed, and numerical estimates relevant to anticipated experimental settings are provided.", "date": "2006-04-01", "date_type": "published", "publication": "Physical Review B", "volume": "73", "number": "13", "publisher": "Physical Review B", "pagerange": "Art. No. 134504", "id_number": "CaltechAUTHORS:HERprb06", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:HERprb06", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.73.134504", "primary_object": { "basename": "HERprb06.pdf", "url": "https://authors.library.caltech.edu/records/qkerg-zct30/files/HERprb06.pdf" }, "resource_type": "article", "pub_year": "2006", "author_list": "Hermele, Michael; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/rspeh-dbs50", "eprint_id": 7128, "eprint_status": "archive", "datestamp": "2023-08-22 04:34:31", "lastmod": "2023-10-16 20:43:41", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Werner-P", "name": { "family": "Werner", "given": "Philipp" }, "orcid": "0000-0002-2136-6568" }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Troyer-M", "name": { "family": "Troyer", "given": "Matthias" } } ] }, "title": "Simulation results for an interacting pair of resistively shunted Josephson junctions", "ispublished": "pub", "full_text_status": "public", "keywords": "dissipative systems (theory), quantum Monte Carlo simulations, quantum phase transitions (theory)", "note": "Copyright \u00a9 Institute of Physics and IOP Publishing Limited 2005. \n\nReceived 11 August 2005, accepted for publication 2 November 2005. Published 5 December 2005. \n\nWe acknowledge support by the Swiss National Science Foundation and NSF grant PHY99-07949, as well as helpful discussions with S Chakravarty, E Demler and D Fisher. Part of this work was completed at the Kavli Institute for Theoretical Physics, UCSB. We are also grateful for the hospitality of the Aspen Institute of Physics. The calculations have been performed on the Asgard and Hreidar Beowulf clusters at ETH Z\u00a8urich, using the ALPS library [18].\n\nE-print number: cond-mat/0508163", "abstract": "Using a new cluster Monte Carlo algorithm, we study the phase diagram and critical properties of an interacting pair of resistively shunted Josephson junctions. This system models tunnelling between two electrodes through a small superconducting grain, and is described by a double sine-Gordon model. In accordance with theoretical predictions, we observe three different phases and crossover effects arising from an intermediate coupling fixed point. On the superconductor-to-metal phase boundary, the observed critical behaviour is within error-bars the same as in a single junction, with identical values of the critical resistance and a correlation function exponent which depends only on the strength of the Josephson coupling. We explain these critical properties on the basis of a renormalization group (RG) calculation. In addition, we propose an alternative new mean-field theory for this transition, which correctly predicts the location of the phase boundary at intermediate Josephson coupling strength.", "date": "2005-12-01", "date_type": "published", "publication": "Journal of Statistical Mechanics: Theory and Experiment", "volume": "2005", "number": "12", "publisher": "Journal of Statistical Mechanics: Theory and Experiment", "pagerange": "P12003", "id_number": "CaltechAUTHORS:WERjsmte05", "issn": "1742-5468", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:WERjsmte05", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1088/1742-5468/2005/12/P12003", "primary_object": { "basename": "WERjsmte05.pdf", "url": "https://authors.library.caltech.edu/records/rspeh-dbs50/files/WERjsmte05.pdf" }, "resource_type": "article", "pub_year": "2005", "author_list": "Werner, Philipp; Refael, Gil; et el." }, { "id": "https://authors.library.caltech.edu/records/b8q23-y6705", "eprint_id": 7129, "eprint_status": "archive", "datestamp": "2023-08-22 04:04:23", "lastmod": "2023-10-16 20:43:43", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Lin-H-H", "name": { "family": "Lin", "given": "Hsiu-Hau" } } ] }, "title": "Ground-state degeneracy of correlated insulators with edges", "ispublished": "pub", "full_text_status": "public", "keywords": "ground states; insulating materials; topology", "note": "\u00a92005 The American Physical Society \n\n(Received 24 June 2005; published 26 August 2005) \n\nWe would like to thank Leon Balents, Matthew Fisher, Arun Paramekanti, Tami Pereg-Barnea, and particularly Masaki Oshikawa for insightful discussions. H.H.L. is grateful for support from NSC-91-2120-M-007-001 and NSC-92-2112-M-007-039. G.R. thankfully acknowledges support from NSF fund PHY99-07949.", "abstract": "Using the topological flux insertion procedure, the ground-state degeneracy of an insulator on a periodic lattice with filling factor nu=p/q was found to be at least q-fold. Applying the same argument in a lattice with edges, we show that the degeneracy is modified by the additional edge density nuE associated with the open boundaries. To carry out this generalization we demonstrate how to distinguish between bulk and edge states, and follow how an edge modifies the thermodynamic limit of Oshikawa's original argument. In particular, we also demonstrate that these edge corrections may even make an insulator with integer bulk filling degenerate.", "date": "2005-08-15", "date_type": "published", "publication": "Physical Review B", "volume": "72", "number": "7", "publisher": "Physical Review B", "pagerange": "Art. No. 073109", "id_number": "CaltechAUTHORS:REFprb05", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprb05", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.72.073109", "primary_object": { "basename": "REFprb05.pdf", "url": "https://authors.library.caltech.edu/records/b8q23-y6705/files/REFprb05.pdf" }, "resource_type": "article", "pub_year": "2005", "author_list": "Refael, Gil and Lin, Hsiu-Hau" }, { "id": "https://authors.library.caltech.edu/records/wvf22-gg979", "eprint_id": 7102, "eprint_status": "archive", "datestamp": "2023-08-22 04:03:49", "lastmod": "2023-10-16 20:42:48", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Galitski-V-M", "name": { "family": "Galitski", "given": "Victor M." } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Fisher-Matthew-P-A", "name": { "family": "Fisher", "given": "Matthew P. A." } }, { "id": "Senthil-T", "name": { "family": "Senthil", "given": "T." } } ] }, "title": "Vortices and Quasiparticles near the Superconductor-Insulator Transition in Thin Films", "ispublished": "pub", "full_text_status": "public", "keywords": "superconducting thin films; amorphous state; superconducting transitions; flux-line lattice", "note": "\u00a92005 The American Physical Society \n\n(Received 9 May 2005; published 9 August 2005) \n\nIt is a pleasure to thank A. Auerbach, L. Balents,\nA. Kapitulnik, S. Kivelson, A.I. Larkin, O. Motrunich, Y. Oreg, and D. Shahar for discussions on this work. This work was generously supported by the David and Lucile Packard foundation (V.G.) and by the National Science Foundation through Grant Nos. PHY99-07949 (V.G., G.R., and M.P.A.F.), DMR-0210790 (M.P.A.F.), and DMR-0308945 (T.S.). T.S. also acknowledges funding from the NEC Corporation, the Alfred P. Sloan Foundation, and The Research Corporation.", "abstract": "We study the low temperature behavior of an amorphous superconducting film driven normal by a perpendicular magnetic-field (B). For this purpose we introduce a new two-fluid formulation consisting of fermionized field-induced vortices and electrically neutralized Bogoliubov quasiparticles (spinons) interacting via a long-ranged statistical interaction. This approach allows us to access a novel non-Fermi-liquid phase, which naturally interpolates between the low B superconductor and the high B normal metal. We discuss the properties of the resulting \"vortex metal\" phase.", "date": "2005-08-12", "date_type": "published", "publication": "Physical Review Letters", "volume": "95", "number": "7", "publisher": "American Physical Society", "pagerange": "Art. No. 077002", "id_number": "CaltechAUTHORS:GALprl05", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:GALprl05", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevLett.95.077002", "primary_object": { "basename": "GALprl05.pdf", "url": "https://authors.library.caltech.edu/records/wvf22-gg979/files/GALprl05.pdf" }, "resource_type": "article", "pub_year": "2005", "author_list": "Galitski, Victor M.; Refael, G.; et el." }, { "id": "https://authors.library.caltech.edu/records/1py5w-a6h24", "eprint_id": 7109, "eprint_status": "archive", "datestamp": "2023-08-22 02:52:36", "lastmod": "2023-10-16 20:43:01", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "G." } }, { "id": "Moore-J-E", "name": { "family": "Moore", "given": "J. E." } } ] }, "title": "Entanglement Entropy of Random Quantum Critical Points in One Dimension", "ispublished": "pub", "full_text_status": "public", "keywords": "critical points; quantum entanglement; Ising model; Heisenberg model", "note": "\u00a92004 The American Physical Society \n\n(Received 29 June 2004; published 21 December 2004) \n\nWe gratefully acknowledge useful conversations with L. Balents, A. Kitaev, A.W.W. Ludwig, J. Preskill, and G. Vidal, and support from NSF PHY99-07949, DMR-0238760, and the Hellman Foundation.", "abstract": "For quantum critical spin chains without disorder, it is known that the entanglement of a segment of N>>1 spins with the remainder is logarithmic in N with a prefactor fixed by the central charge of the associated conformal field theory. We show that for a class of strongly random quantum spin chains, the same logarithmic scaling holds for mean entanglement at criticality and defines a critical entropy equivalent to central charge in the pure case. This effective central charge is obtained for Heisenberg, XX, and quantum Ising chains using an analytic real-space renormalization-group approach believed to be asymptotically exact. For these random chains, the effective universal central charge is characteristic of a universality class and is consistent with a c-theorem.", "date": "2004-12-31", "date_type": "published", "publication": "Physical Review Letters", "volume": "93", "number": "26", "publisher": "American Physical Society", "pagerange": "Art. No. 260602", "id_number": "CaltechAUTHORS:REFprl04", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprl04", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevLett.93.260602", "primary_object": { "basename": "REFprl04.pdf", "url": "https://authors.library.caltech.edu/records/1py5w-a6h24/files/REFprl04.pdf" }, "resource_type": "article", "pub_year": "2004", "author_list": "Refael, G. and Moore, J. E." }, { "id": "https://authors.library.caltech.edu/records/azgs0-qpn28", "eprint_id": 7104, "eprint_status": "archive", "datestamp": "2023-08-22 02:32:51", "lastmod": "2023-10-16 20:42:52", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Altman-E", "name": { "family": "Altman", "given": "Elud" } }, { "id": "Kafri-Y", "name": { "family": "Kafri", "given": "Yariv" } }, { "id": "Polkovnikov-A", "name": { "family": "Polkovnikov", "given": "Anatoli" } }, { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } } ] }, "title": "Phase Transition in a System of One-Dimensional Bosons with Strong Disorder", "ispublished": "pub", "full_text_status": "public", "keywords": "boson systems; phase transformations; renormalisation; random processes; superfluidity", "note": "\u00a92004 The American Physical Society \n\n(Received 6 February 2004; published 7 October 2004) \n\nWe are grateful to L. Balents, E. Demler, D.S. Fisher, M.P.A. Fisher, S.M. Girvin, D. Greenbaum, A. Paramekanti, N. Prokof'ev, S. Sachdev, and D-W. Wang for useful discussions and comments. This work was supported by ARO and NSF under Grants No. DMR-0233773, No. DMR-0231631, No. DMR-0213805, No. DMR-0229243, and No. PHY99-07949.", "abstract": "We study one-dimensional disordered bosons at large commensurate filling. Using a real space renormalization group approach, we find a new random fixed point which controls a phase transition from a superfluid to an incompressible Mott glass. The transition can be tuned by changing the disorder distribution even with vanishing interactions. We derive the properties of the transition, which suggest that it is in the Kosterlitz-Thouless universality class.", "date": "2004-10-08", "date_type": "published", "publication": "Physical Review Letters", "volume": "93", "number": "15", "publisher": "American Physical Society", "pagerange": "Art. No. 150402", "id_number": "CaltechAUTHORS:ALTprl04", "issn": "0031-9007", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:ALTprl04", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevLett.93.150402", "primary_object": { "basename": "ALTprl04.pdf", "url": "https://authors.library.caltech.edu/records/azgs0-qpn28/files/ALTprl04.pdf" }, "resource_type": "article", "pub_year": "2004", "author_list": "Altman, Elud; Kafri, Yariv; et el." }, { "id": "https://authors.library.caltech.edu/records/ndxq4-xt337", "eprint_id": 7130, "eprint_status": "archive", "datestamp": "2023-08-22 02:16:47", "lastmod": "2023-10-16 20:43:45", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Fisher-D-S", "name": { "family": "Fisher", "given": "Daniel S." } } ] }, "title": "Energy correlations in random transverse field Ising spin chains", "ispublished": "pub", "full_text_status": "public", "keywords": "Ising model; renormalisation", "note": "\u00a92004 The American Physical Society \n\n(Received 8 August 2003; revised 28 April 2004; published 17 August 2004) \n\nThis work has been supported in part by the National Science Foundation via DMR-9976621, DMR-9809363, and the MRSEC at Harvard. One of us (G.R.) was supported in part by a Harvard Merit Fellowship.", "abstract": "The end-to-end energy-energy correlations of random transverse field quantum Ising spin chains are computed using a generalization of an asymptotically exact real space renormalization group (RG) previously introduced. Away from the critical point, the average energy-energy correlations decay exponentially with a correlation length that is the same as that of the spin-spin correlations. The typical correlations, however, decay exponentially with a characteristic length, proportional to the square root of the primary correlation length. At the quantum critical point, the average correlations decay subexponentially as [overline C[sub L]]~e\u2013const L1/3, whereas the typical correlations decay faster, as ~e-Ksqrt(L), with K a random variable with a universal distribution. The critical energy-energy correlations behave very similarly to the smallest gap, computed previously; this is explained in terms of the RG flow and the excitation structure of the chain. In order to obtain the energy correlations, an extension of the previously used methods was needed; here, this was carried out via RG transformations that involve a sequence of unitary transformations.", "date": "2004-08-01", "date_type": "published", "publication": "Physical Review B", "volume": "70", "number": "6", "publisher": "Physical Review B", "pagerange": "Art. No. 064409", "id_number": "CaltechAUTHORS:REFprb04", "issn": "1098-0121", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprb04", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.70.064409", "primary_object": { "basename": "REFprb04.pdf", "url": "https://authors.library.caltech.edu/records/ndxq4-xt337/files/REFprb04.pdf" }, "resource_type": "article", "pub_year": "2004", "author_list": "Refael, Gil and Fisher, Daniel S." }, { "id": "https://authors.library.caltech.edu/records/zncw8-psc26", "eprint_id": 7131, "eprint_status": "archive", "datestamp": "2023-08-22 01:12:51", "lastmod": "2023-10-16 20:43:47", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Demler-E", "name": { "family": "Demler", "given": "Eugene" } }, { "id": "Oreg-Y", "name": { "family": "Oreg", "given": "Yuval" } }, { "id": "Fisher-D-S", "name": { "family": "Fisher", "given": "Daniel S." } } ] }, "title": "Dissipation and quantum phase transitions of a pair of Josephson junctions", "ispublished": "pub", "full_text_status": "public", "note": "\u00a92003 The American Physical Society \n\nReceived 2 March 2003; revised 7 October 2003; published 24 December 2003 \n\nWe would like to thank A. Amir, A. Bezryadin, S. Chakravarty, M. Dykman, E. Fradkin, L. Glazman, B. Halperin, W. Hofstetter, Y. Imry, R. Kapon, S. Kivelson, N. Markovic, D. Podolsky, L. Pryadko, M. Tinkham, and G. Zarand for helpful discussions. This research was supported by the National Science Foundation via Grant Nos. DMR-0132874 (E.D.) and DMR-9976621 (G.R., Y.O., and D.S.F.), by Harvard's Materials Research Science and Engineering Center, by the Sloan Foundation (E.D.), and by the Israeli Science Foundation via Grant No. 160/01-1 (Y.O.).", "abstract": "A model system consisting of a mesoscopic superconducting grain coupled by Josephson junctions to two macroscopic superconducting electrodes is studied. We focus on the effects of Ohmic dissipation caused by resistive shunts and superconducting-normal charge relaxation within the grain. As the temperature is lowered, the behavior crosses over from uncoupled Josephson junctions, similar to situations analyzed previously, to strongly interacting junctions. The crossover temperature is related to the energy-level spacing of the grain and is of the order of the inverse escape time from the grain. In the limit of zero temperature, the two-junction system exhibits five distinct quantum phases, including a novel superconducting state with localized Cooper pairs on the grain but phase coherence between the leads due to Cooper pair cotunneling processes. In contrast to a single junction, the transition from the fully superconducting to fully normal phases is found to be controlled by an intermediate-coupling fixed point whose critical exponents vary continuously as the resistances are changed. The model is analyzed via two-component sine-Gordon models and related Coulomb gases that provide effective low-temperature descriptions in both the weak and strong Josephson coupling limits. The complicated phase diagram is consistent with symmetries of the two component sine-Gordon models, which include weak- to strong-coupling duality and permutation triality. Experimental consequences of the results and potential implications for superconductor to normal transitions in thin wires and films are discussed briefly.", "date": "2003-12-01", "date_type": "published", "publication": "Physical Review B", "volume": "68", "number": "21", "publisher": "Physical Review B", "pagerange": "Art. No. 214515", "id_number": "CaltechAUTHORS:REFprb03", "issn": "0163-1829", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprb03", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.68.214515", "primary_object": { "basename": "REFprb03.pdf", "url": "https://authors.library.caltech.edu/records/zncw8-psc26/files/REFprb03.pdf" }, "resource_type": "article", "pub_year": "2003", "author_list": "Refael, Gil; Demler, Eugene; et el." }, { "id": "https://authors.library.caltech.edu/records/nxvjd-f5t31", "eprint_id": 7132, "eprint_status": "archive", "datestamp": "2023-08-21 23:35:21", "lastmod": "2023-10-16 20:43:50", "type": "article", "metadata_visibility": "show", "creators": { "items": [ { "id": "Refael-G", "name": { "family": "Refael", "given": "Gil" } }, { "id": "Kehrein-S", "name": { "family": "Kehrein", "given": "Stefan" } }, { "id": "Fisher-D-S", "name": { "family": "Fisher", "given": "Daniel S." } } ] }, "title": "Spin reduction transition in spin-3/2 random Heisenberg chains", "ispublished": "pub", "full_text_status": "public", "note": "\u00a92002 The American Physical Society \n\nReceived 6 June 2002; published 2 August 2002 \n\nThis work has been supported in part by the National Science Foundation via Grant Nos. DMR-9976621 and DMR-9809334. S.K. was also supported by a DFG Fellowship and through Grant No. SFB 484 of the DFG. G.R. would like to thank J. P. Sethna for useful discussions.", "abstract": "Random spin-3/2 antiferromagnetic Heisenberg chains are investigated using an asymptotically exact renormalization group. Randomness is found to induce a quantum phase transition between two random-singlet phases. In the strong randomness phase the effective spins at low energies are Seff=3/2, while in the weak randomness phase the effective spins are Seff=1/2. Separating them is a quantum critical point near which there is a nontrivial mixture of spin-1/2, spin-1, and spin-3/2 effective spins at low temperatures.", "date": "2002-08-01", "date_type": "published", "publication": "Physical Review B", "volume": "66", "number": "6", "publisher": "Physical Review B", "pagerange": "Art. No. 060402", "id_number": "CaltechAUTHORS:REFprb02", "issn": "0163-1829", "official_url": "https://resolver.caltech.edu/CaltechAUTHORS:REFprb02", "rights": "No commercial reproduction, distribution, display or performance rights in this work are provided.", "doi": "10.1103/PhysRevB.66.060402", "primary_object": { "basename": "REFprb02.pdf", "url": "https://authors.library.caltech.edu/records/nxvjd-f5t31/files/REFprb02.pdf" }, "resource_type": "article", "pub_year": "2002", "author_list": "Refael, Gil; Kehrein, Stefan; et el." } ]