Noise-Induced Backscattering in a Quantum Spin Hall Edge
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1.
Microsoft (United States)
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2.
California Institute of Technology
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.
Additional Information
© 2018 American Physical Society. Received 31 May 2018; published 6 September 2018. We thank Gijs de Lange and John Watson for helpful discussions and especially thank Leonid Glazman for his perceptive insights. We also gratefully acknowledge support from the National Science Foundation through Grant No. DMR-1723367; the Caltech Institute for Quantum Information and Matter, a 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.Attached Files
Published - PhysRevLett.121.106601.pdf
Submitted - 1803.01021.pdf
Supplemental Material - supplement.pdf
Files
1803.01021.pdf
Additional details
Identifiers
- Eprint ID
- 89417
- Resolver ID
- CaltechAUTHORS:20180906-130214378
Related works
- Describes
- https://arxiv.org/abs/1803.01021 (URL)
Funding
- NSF
- DMR-1723367
- Institute for Quantum Information and Matter (IQIM)
- Gordon and Betty Moore Foundation
- GBMF1250
- Walter Burke Institute for Theoretical Physics, Caltech
Dates
- Created
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2018-09-07Created from EPrint's datestamp field
- Updated
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2021-11-16Created from EPrint's last_modified field