Supercurrent dephasing by electron-electron interactions
arXiv:1411.2558 · doi:10.1103/PhysRevB.91.024505
Abstract
We demonstrate that in sufficiently long diffusive superconducting-normal-superconducting () 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 in the problem. Provided the temperature length exceeds this dephasing length can be conveniently extracted from equilibrium measurements of the Josephson current.
11 pages, 3 figures
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