Interface dependence of the Josephson-current fluctuations in short SNS junctions

摘要

We discuss the dependence of the Josephson current correlations in mesoscopicsuperconductor/normal-conductor/superconductor (SNS) devices on thetransparency of the superconductor/normal-conductor (SN) interfaces. Focusingon short junctions we apply the supersymmetry method to construct an effectivefield theory for mesoscopic SNS devices which is evaluated in the limit ofhighly and weakly transparent interfaces. We show that the two-pointJosephson-current correlator differs by an universal factor 2 in these twocases.