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. https://resolver.caltech.edu/CaltechAUTHORS:20171004-145628173

	PDF - Published Version See Usage Policy. 694kB
	PDF - Submitted Version See Usage Policy. 2MB
	PDF (Details of numerical calculations; detailed derivation of Eq.~(3) of the main text; effective models from k.p calculations) - Supplemental Material See Usage Policy. 606kB

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20171004-145628173

Abstract

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

Related URLs:

URL	URL Type	Description
https://doi.org/10.1103/PhysRevB.98.201404	DOI	Article
https://journals.aps.org/prb/supplemental/10.1103/PhysRevB.98.201404	Publisher	Supplementary Material
https://arxiv.org/abs/1709.04830	arXiv	Discussion Paper

ORCID:

Author	ORCID
Alicea, Jason	0000-0001-9979-3423

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

Funders:

Funding Agency	Grant Number
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO)	UNSPECIFIED
Microsoft Corporation Station Q	UNSPECIFIED
NSF	DMR-1723367
Army Research Office	W911NF-17-1-0323
Institute for Quantum Information and Matter (IQIM)	UNSPECIFIED
Gordon and Betty Moore Foundation	GBMF1250
Walter Burke Institute for Theoretical Physics, Caltech	UNSPECIFIED

Issue or Number:

DOI:

10.1103/PhysRevB.98.201404

Record Number:

CaltechAUTHORS:20171004-145628173

Persistent URL:

https://resolver.caltech.edu/CaltechAUTHORS:20171004-145628173

Usage Policy:

No commercial reproduction, distribution, display or performance rights in this work are provided.

ID Code:

82083

Collection:

CaltechAUTHORS

Deposited By:

Joy Painter

Deposited On:

05 Oct 2017 16:58

Last Modified:

15 Nov 2021 19:48

Repository Staff Only: item control page