Robustness of helical edge states under edge reconstruction

John, Niels; Del Maestro, Adrian; Rosenow, Bernd

doi:10.1209/0295-5075/ac954a

Title: Robustness of helical edge states under edge reconstruction

Journal Article · 17 October 2022 · Europhysics Letters

DOI: https://doi.org/10.1209/0295-5075/ac954a · OSTI ID:1893557

John, Niels; Del Maestro, Adrian; Rosenow, Bernd

Abstract The helical edge states of time-reversal invariant two-dimensional topological insulators are protected against backscattering in idealized models. In more realistic scenarios with a shallow confining potential at the sample boundary, additional strongly interacting edge states may arise, that could interfere with the topological protection of edge conduction. We find that interaction effects within the reconstructed edges are well described by the Luttinger liquid model. While interactions between this Luttinger liquid and the helical edge states can in principle give rise to dynamical spin polarization and the breaking of time-reversal symmetry, we demonstrate that random spin-orbit coupling strongly suppresses such dynamical spin polarization, resulting in the persistence of near quantized edge conduction.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0022311

OSTI ID:: 1893557

Journal Information:: Europhysics Letters, Journal Name: Europhysics Letters Journal Issue: 2 Vol. 140; ISSN 0295-5075

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: France

Language:: English

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