Large sample-to-sample fluctuations of the nonequilibrium critical current through mesoscopic Josephson junctions

Details Large sample-to-sample fluctuations of the nonequilibrium critical current through mesoscopic Josephson junctions Large sample-to-sample fluctuations of the nonequilibrium critical current through mesoscopic Josephson junctions

2000-04-12

arxiv.org/abs/cond-mat/0004197v1

Phys. Rev. B 63, 054512 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.63.054512

We present a theory for the nonequilibrium current in a mesoscopic Josephson junction which is coupled to a normal electron reservoir, and apply it to a chaotic junction. Large sample-to-sample fluctuations of the critical current $I_{\rm c}$ are found, with ${rms} I_{\rm c} \simeq \sqrt{N}e\Delta/\hbar$, when the voltage difference eV between the electron reservoir and the junction exceeds the superconducting gap $\Delta$ and the number of modes N connecting the junction to the superconducting electrodes is large.

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