Probing the helical edge states of a topological insulator by Cooper-pair injection

Pierre Adroguer, Charles Grenier, David Carpentier, J. Cayssol, Pascal Degiovanni, E. Orignac

Type: Article

Publication Date: 2010-08-05

Citations: 68

DOI: https://doi.org/10.1103/physrevb.82.081303

Abstract

We consider the proximity effect between a singlet $s$-wave superconductor and the edge of a quantum spin Hall (QSH) topological insulator. We establish that Andreev reflection at a QSH edge state/superconductor interface is perfect while nonlocal Andreev processes through the superconductor are totally suppressed. We compute the corresponding conductance and noise.

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arXiv (Cornell University) - View - PDF
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Physical Review B - View

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