Supercurrent fluctuations in short filaments

Details Supercurrent fluctuations in short filaments Supercurrent fluctuations in short filaments

2011-09-11

arxiv.org/abs/1109.2334v1

Physics

Condensed Matter

Superconductivity

Scientific paper

We evaluate the average and the standard deviation of the supercurrent in superconducting nanobridges, as functions of the temperature and the phase difference, in an equilibrium situation. We also evaluate the autocorrelation of the supercurrent as a function of the elapsed time. The behavior of supercurrent fluctuations is qualitatively different from from that of the normal current: they depend on the phase difference, have a different temperature dependence, and for appropriate range their standard deviation is independent of the probing time. We considered two radically different filaments and obtained very similar results for both. Fluctuations of the supercurrent can in principle be measured.

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