Can mesoscopic fluctuations reverse the supercurrent through a disordered Josephson junction?

2001/06/01 by M. Titov, Ph. Jacquod, C. W. J. Beenakker
Physics and Astronomy · #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevb.65.012504

published as Phys. Rev. B 65, 012504 (2002) · 2 pages

arxiv created 2001/06/01 · arxiv updated 2009/11/30

Abstract

We calculate the Josephson coupling energy U_J(ϕ) (related to the supercurrent I=(2e/ℏ) dU_J/dϕ) for a disordered normal metal between two superconductors with a phase difference ϕ. We demonstrate that the symmetry of the scattering matrix of non-interacting quasiparticles in zero magnetic field implies that U_J(ϕ) has a minimum at ϕ=0. A maximum (that would lead to a π-junction or negative superfluid density) is excluded for any realization of the disorder.

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