Journal
NATURE COMMUNICATIONS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms8252
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Funding
- Defense Advanced Research Projects Agency Microsystems Technology Office, MesoDynamic Architecture Program (MESO) [N66001-11-1-4105]
- Center for Probing the Nanoscale
- NSF NSEC [PHY-0830228]
- NSF [DMR1305731]
- Gordon and Betty Moore Foundation [GBMF3133]
- Foundation's EPiQS Initiative [GBMF4546]
- European Union [FP7-PEOPLE-2010-274769]
- Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
- German Research Foundation (DFG) [HA5893/4-1, SPP 1666]
- EU [3-TOP]
- Elitenetzwerk Bayern program 'Topologische Isolatoren'
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1305731] Funding Source: National Science Foundation
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The realization of quantum spin Hall effect in HgTe quantum wells is considered a milestone in the discovery of topological insulators. Quantum spin Hall states are predicted to allow current flow at the edges of an insulating bulk, as demonstrated in various experiments. A key prediction yet to be experimentally verified is the breakdown of the edge conduction under broken time-reversal symmetry. Here we first establish a systematic framework for the magnetic field dependence of electrostatically gated quantum spin Hall devices. We then study edge conduction of an inverted quantum well device under broken time-reversal symmetry using microwave impedance microscopy, and compare our findings to a noninverted device. At zero magnetic field, only the inverted device shows clear edge conduction in its local conductivity profile, consistent with theory. Surprisingly, the edge conduction persists up to 9 T with little change. This indicates physics beyond simple quantum spin Hall model, including material-specific properties and possibly many-body effects.
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