Absence of charge backscattering in the nonequilibrium current of normal-superconductor structures

Details Absence of charge backscattering in the nonequilibrium current of normal-superconductor structures Absence of charge backscattering in the nonequilibrium current of normal-superconductor structures

1996-02-26

arxiv.org/abs/cond-mat/9602134v1

Physics

Condensed Matter

Latex file, 11 pages, 2 figures available upon request jsc@jav.fmc.uam.es, to be published in Journal of Physics: Condensed Ma

Scientific paper

10.1088/0953-8984/8/13/001

We study the nonequilibrium transport properties of a normal-superconductor-normal structure, focussing on the effect of adding an impurity in the superconducting region. Current conservation requires the superfluid velocity to be nonzero, causing a distortion of the quasiparticle dispersion relation within the superconductor. For weakly reflecting interfaces we find a regime of intermediate voltages in which Andreev transmission is the only permitted mechanism for quasiparticles to enter the superconductor. Impurities in the superconductor can only cause Andreev reflection of these quasiparticles and thus cannot degrade the current. At higher voltages, a state of gapless superconductivity develops which is sensitive to the presence of impurities.

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