Journal
PHYSICAL REVIEW B
Volume 87, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.104202
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Funding
- EU-FP7 Marie Curie IRG
- DARPA
- FENA
- Humboldt foundation
- IQIM
- NSF Physics Frontiers Center
- Gordon and Betty Moore Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1125565] Funding Source: National Science Foundation
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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. DOI: 10.1103/PhysRevB.87.104202
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