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Disordered topological metals

Meyer, Julia S. and Refael, Gil (2013) Disordered topological metals. Physical Review B, 87 (10). Art. No. 104202. ISSN 1098-0121. doi:10.1103/PhysRevB.87.104202.

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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.

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Additional Information:© 2013 American Physical Society. Received 22 November 2012; published 26 March 2013. We acknowledge helpful discussions with Victor Gurarie, Doron Bergman, and Matt Hastings. This work was funded through an EU-FP7 Marie Curie IRG (JM), and by DARPA and FENA (GR), the Humboldt foundation, and the IQIM, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation. We also thank the Aspen Center for Physics, where part of the work was done.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
European Union (EU) FP7 Marie Curie IRGUNSPECIFIED
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Humboldt foundationUNSPECIFIED
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
NSF Physics Frontiers CenterUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Issue or Number:10
Classification Code:PACS: 73.20.At, 71.10.Hf
Record Number:CaltechAUTHORS:20130425-082200743
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Official Citation:Meyer, J. S. and G. Refael (2013). "Disordered topological metals." Physical Review B 87(10): 104202.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38110
Deposited By: Tony Diaz
Deposited On:09 May 2013 23:35
Last Modified:09 Nov 2021 23:33

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