Non-equilibrium Josephson-like effects in mesoscopic S-N-S junctions

Details Non-equilibrium Josephson-like effects in mesoscopic S-N-S junctions Non-equilibrium Josephson-like effects in mesoscopic S-N-S junctions

1997-08-30

arxiv.org/abs/cond-mat/9709001v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages (with figures embedded)

Scientific paper

Wide mesoscopic superconducting - normal-metal - superconducting (S-N-S) junctions exhibit Andreev bound states which carry substantial supercurrents, even at temperatures for which the equilibrium Josephson effect is exponentially small --- the currents carried by different states can cancel each other. This cancellation is incomplete whenever the junctions are driven out of equilibrium, e.g., by a dc voltage. This leads to phenomena similar to the usual dc and ac Josephson effects, but dominated by the second harmonic of the Josephson frequency, which may explain some striking recent experiments. A simple description of these, in the spirit of the Resistively-Shunted-Junction model, is suggested.

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