ar X iv : c on d - m at / 9 50 41 17 v 1 2 8 A pr 1 99 5 Quasiparticle current in ballistic NcS ′ S junctions

نویسندگان

  • A. A. Golubov
  • M. Yu. Kupriyanov
چکیده

Nonstationary properties of ballistic constrictions N cS ′ S with disordered S ′ S electrodes are analyzed theoretically. Amplitudes of Andreev and normal reflections at the constriction are related to the solutions of a stationary Green function problem in an inhomogeneous S ′ S electrode in a dirty limit. This provides a generalization of the model of Blonder, Tinkham and Klapwijk for a spatially inhomogeneous case. The relation between quasiparticle current in N cS ′ S junctions and energy spectrum of a S ′ S proximity sandwich is found for arbitrary parameters of S ′ and S materials and of S ′ S interface.

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تاریخ انتشار 1995