Universal limit of critical-current fluctuations in mesoscopic Josephson junctions
C. W. J. Beenakker
DOI 10.1103/PhysRevLett.67.3836 · Physical Review Letters
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Abstract
The sample-to-sample fluctuations in the critical current of a disordered Josesphson junction are analyzed by means of a transmission-matrix formalism. If the junction becomes small compared to the superconducting coherence length, the fluctuations at T=0 become of order eΔ0/ħ, dependent only on the energy gap Δ0 of the bulk superconductors and independent of junction length or mean free path. This universal limit is reached in weak links formed from point contacts or microbridges.
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