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

T. Micklitz

doi:10.1103/PhysRevB.75.144509

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

T. Micklitz

DOI 10.1103/PhysRevB.75.144509 · Physical Review B

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Abstract

We discuss the dependence of the Josephson-current correlations in mesoscopic superconductor/normal-conductor/superconductor (SNS) devices on the transparency of the superconductor/normal-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.