Low Temperature Physics: 30, 398 (2004); https://doi.org/10.1063/1.1739160 (7 pages)
Fizika Nizkikh Temperatur: Volume 30, Number 5 (May 2004), p. 535-543    ( to contents , go back )

Chiral symmetry breaking and the Josephson current in a ballistic superconductor-quantum wire-superconductor junction

I.V. Krive1,2, L.Y. Gorelik1, R.I. Shekhter1, and M. Jonson1

1Department of Applied Physics, Chalmers University of Technology and Göteborg University SE-412 96 Göteborg, Sweden

2B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
E-mail: krive@ilt.kharkov.ua

Received November 7, 2003, revised December 15, 2003

Abstract

We evaluate the Josephson current through a quasi-1D quantum wire coupled to bulk superconductors. It is shown that the interplay of Rashba spin–orbit interaction and Zeeman splitting results in the appearence of a Josephson current even in the absence of any phase difference between the superconductors. In a transparent junction (D 1) at low temperatures this anomalous supercurrent Jan appears abruptly for a Zeeman splitting of the order of the Andreev level spacing as the magnetic field is varied. In a low transparency (D << 1) junction one has Jan µ Ö D̅ under special (resonance) conditions. In the absence of Zeeman splitting the anomalous supercurrent disappears. We have investigated the influence of dispersion asymmetry induced by the Rashba interaction in quasi-1D quantum wires on the critical Josephson current and have shown that the breakdown of chiral symmetry enhances the supercurrent.

PACS:
74.80.Fp -
31.30.Gs - Hyperfine interactions and isotope effects, Jahn-Teller effect
71.70.Ej - Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect
73.20.Dx -

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