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Quantum point contact as a probe of a topological superconductor

Open access
Wimmer, M, Akhmerov, A R, Dahlhaus, J P, Beenakker, C W J·2011·New Journal of Physics

Abstract

We calculate the conductance of a ballistic point contact to a superconducting wire, produced by the s-wave proximity effect in a semiconductor with spin–orbit coupling in a parallel magnetic field. The conductance G as a function of contact width or Fermi energy shows plateaux at half-integer multiples of 4 e 2 / h if the superconductor is in a topologically nontrivial phase. In contrast, the plateaux are at the usual integer multiples in the topologically trivial phase. Disorder destroys all plateaux except the first, which remains precisely quantized, consistent with previous results for a tunnel contact. The advantage of a ballistic contact over a tunnel contact as a probe of the topological phase is the strongly reduced sensitivity to finite voltage or temperature.

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Crossref · 10.1088/1367-2630/13/5/053016

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Metadata

Authors
Wimmer, M., Akhmerov, A. R., Dahlhaus, J. P., & Beenakker, C. W. J.
Venue
New Journal of Physics
Published
2011-05-12
Volume
13
Issue
5
Pages
053016
ISSN
1367-2630 (ISSN-L)
OpenAlex
W1983727929
Cited by
260
References
18
FWCI
18.25
Type
journal article
Language
en
Open access
gold

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CoChat. (2026). Citation check: Quantum point contact as a probe of a topological superconductor. https://app.cochat.ai/papers/10.1088/1367-2630/13/5/053016
The paper
Wimmer, M., Akhmerov, A. R., Dahlhaus, J. P., & Beenakker, C. W. J. (2011). Quantum point contact as a probe of a topological superconductor. New Journal of Physics. https://doi.org/10.1088/1367-2630/13/5/053016

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.