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Robust helical edge transport in quantum spin Hall quantum wells

Skolasinski, Rafal and Pikulin, Dmitry I. and Alicea, Jason and Wimmer, Michael (2018) Robust helical edge transport in quantum spin Hall quantum wells. Physical Review B, 98 (20). Art. No. 201404. ISSN 2469-9950. doi:10.1103/PhysRevB.98.201404.

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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.

Item Type:Article
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URLURL TypeDescription Material Paper
Alicea, Jason0000-0001-9979-3423
Additional Information:© 2018 American Physical Society. Received 14 September 2017; published 14 November 2018. We acknowledge useful discussions with L. Molenkamp, A. R. Akhmerov, and T. Hyart. R.S. and M.W. were supported by the Dutch national science organization NWO. D.I.P. acknowledges support by Microsoft Corporation Station Q. J.A. gratefully acknowledges support from the National Science Foundation through Grant No. DMR-1723367; the Army Research Office under Grant Award No. W911NF-17-1-0323; the Caltech Institute for Quantum Information and Matter, an NSF Physics Frontiers Center with support of the Gordon and Betty Moore Foundation through Grant No. GBMF1250; and the Walter Burke Institute for Theoretical Physics at Caltech.
Group:Institute for Quantum Information and Matter, Walter Burke Institute for Theoretical Physics
Funding AgencyGrant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)UNSPECIFIED
Microsoft Corporation Station QUNSPECIFIED
Army Research OfficeW911NF-17-1-0323
Institute for Quantum Information and Matter (IQIM)UNSPECIFIED
Gordon and Betty Moore FoundationGBMF1250
Walter Burke Institute for Theoretical Physics, CaltechUNSPECIFIED
Issue or Number:20
Record Number:CaltechAUTHORS:20171004-145628173
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82083
Deposited By: Joy Painter
Deposited On:05 Oct 2017 16:58
Last Modified:15 Nov 2021 19:48

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