Robust helical edge transport in quantum spin Hall quantum wells

Rafal Skolasinski, Dmitry I. Pikulin, Jason Alicea, Michael Wimmer

Research output: Contribution to journalArticleScientificpeer-review

19 Citations (Scopus)
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We show that edge-state transport in semiconductor-based quantum spin Hall systems is unexpectedly robust to magnetic fields. The origin for this robustness lies in an intrinsic suppression of the edge-state g-factor and the fact that the edge-state Dirac point is typically hidden in the valence band. A detailed k·p band-structure analysis reveals that both InAs/GaSb and HgTe/CdTe quantum wells exhibit such buried Dirac points for a wide range of well thicknesses. By simulating transport in a disordered system described within an effective model, we demonstrate that edge-state transport remains nearly quantized up to large magnetic fields, consistent with recent experiments.

Original languageEnglish
Article number201404
Number of pages5
JournalPhysical Review B
Issue number20
Publication statusPublished - 2018


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