TY - JOUR

T1 - Superconductive proximity effect in interacting disordered conductors

AU - Skvortsov, M. A.

AU - Larkin, A. I.

AU - Feigel’man, M. V.

PY - 2001/3/5

Y1 - 2001/3/5

N2 - We present a general theory of the superconductive proximity effect in disordered normal-metal-superconducting (N-S) structures, based on the recently developed [M. V. Feigel’man et al., Phys. Rev. B 61, 12 361 (2000)] Keldysh action approach. In the case of the absence of an interaction in the normal conductor we reproduce known results for the Andreev conductance GA at an arbitrary relation between the interface resistance RT and the diffusive resistance RD. In two-dimensional N-S systems, the electron-electron interaction in the Cooper channel of a normal conductor is shown to strongly affect the value of GA as well as its dependence on temperature, voltage, and magnetic field. In particular, an unusual maximum of GA as a function of temperature and/or magnetic field is predicted for some range of parameters RD and RT. The Keldysh action approach makes it possible to calculate the full statistics of charge transfer in such structures. As an application of this method, we calculate the noise power of an N-S contact as a function of voltage, temperature, magnetic field, and frequency for arbitrary Cooper repulsion in the normal metal and arbitrary values of the ratio RD/RT.

AB - We present a general theory of the superconductive proximity effect in disordered normal-metal-superconducting (N-S) structures, based on the recently developed [M. V. Feigel’man et al., Phys. Rev. B 61, 12 361 (2000)] Keldysh action approach. In the case of the absence of an interaction in the normal conductor we reproduce known results for the Andreev conductance GA at an arbitrary relation between the interface resistance RT and the diffusive resistance RD. In two-dimensional N-S systems, the electron-electron interaction in the Cooper channel of a normal conductor is shown to strongly affect the value of GA as well as its dependence on temperature, voltage, and magnetic field. In particular, an unusual maximum of GA as a function of temperature and/or magnetic field is predicted for some range of parameters RD and RT. The Keldysh action approach makes it possible to calculate the full statistics of charge transfer in such structures. As an application of this method, we calculate the noise power of an N-S contact as a function of voltage, temperature, magnetic field, and frequency for arbitrary Cooper repulsion in the normal metal and arbitrary values of the ratio RD/RT.

UR - http://www.scopus.com/inward/record.url?scp=0034895059&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.63.134507

DO - 10.1103/PhysRevB.63.134507

M3 - Article

AN - SCOPUS:0034895059

VL - 63

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

SN - 1098-0121

IS - 13

ER -