Nonlinearity in NS transport: scattering matrix approach

Details Nonlinearity in NS transport: scattering matrix approach Nonlinearity in NS transport: scattering matrix approach

1996-10-24

arxiv.org/abs/cond-mat/9610175v1

Phys. Rev. B 55, 3146 (1997).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

26 pages, 4 Postscript figures, Latex, to be published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.55.3146

A general formula for the current through a disordered normal--superconducting junction is derived, which is valid at finite temperature and includes the full voltage dependence. The result depends on a multichannel scattering matrix, which describes elastic scattering in the normal region, and accounts for the Andreev scattering at the NS interface. The symmetry of the current with respect to sign reversal in the subgap regime is discussed. The Andreev approximation is used to derive a spectral conductance formula, which applies to voltages both below and above the gap. In a case study the spectral conductance formula is applied to the problem of an NINIS double barrier junction.

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