Noise-induced backscattering in a quantum-spin-Hall edge
Mesoscale and Nanoscale Physics
2018-09-11 v3
Abstract
Time-reversal symmetry suppresses electron backscattering in a quantum-spin-Hall edge, yielding quantized conductance at zero temperature. Understanding the dominant corrections in finite-temperature experiments remains an unsettled issue. We study a novel mechanism for conductance suppression: backscattering caused by incoherent electromagnetic noise. Specifically, we show that an electric potential fluctuating randomly in time can backscatter electrons inelastically without constraints faced by electron-electron interactions. We quantify noise-induced corrections to the dc conductance in various regimes and propose an experiment to test this scenario.
Keywords
Cite
@article{arxiv.1803.01021,
title = {Noise-induced backscattering in a quantum-spin-Hall edge},
author = {Jukka I. Väyrynen and Dmitry I. Pikulin and Jason Alicea},
journal= {arXiv preprint arXiv:1803.01021},
year = {2018}
}
Comments
5+3 pages, 1 figure; shortened version to appear in PRL, added references