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arXiv · 1411.2558

Supercurrent dephasing by electron-electron interactions

Andrew G. Semenov·Andrei D. Zaikin
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Abstract

We demonstrate that in sufficiently long diffusive superconducting-normal-superconducting ($SNS$) junctions dc Josephson current is exponentially suppressed by electron-electron interactions down to zero temperature. This suppression is caused by the effect of {\it Cooper pair dephasing} which occurs in the normal metal and defines a new fundamental length scale $L_\varphi$ in the problem. Provided the temperature length exceeds $L_\varphi$ this dephasing length can be conveniently extracted from equilibrium measurements of the Josephson current.

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Andrew G. Semenov, Andrei D. Zaikin. 2014-11-10. Supercurrent dephasing by electron-electron interactions. https://doi.org/10.1103/physrevb.91.024505

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