Interface dependence of the Josephson-current fluctuations in short mesoscopic superconductorormal-conductor/superconductor junctions

摘要

We discuss the dependence of the Josephson-current correlations in mesoscopic superconductorormal-conductor/superconductor (SNS) devices on the transparency of the superconductorormal-conductor interfaces. Focusing on short junctions we apply the supersymmetry method to construct an effective field theory for mesoscopic SNS devices which is evaluated in the limit of highly and weakly transparent interfaces. We show that the two-point Josephson-current correlator differs by a universal factor of 2 in these two cases.