Coulomb effects on electron transport and shot noise in hybrid normal-metal–superconducting metallic structures

Artem V. Galaktionov and Andrei D. Zaikin
Phys. Rev. B 73, 184522 – Published 22 May 2006

Abstract

We analyze the effect of electron-electron interactions on Andreev current and shot noise in diffusive hybrid structures composed of a normal metal attached to a superconductor via a weakly transmitting interface. We demonstrate that at voltages/temperatures below the Thouless energy of a normal metal, Coulomb interaction yields a reduction of both Andreev current and its noise by a constant factor which essentially depends on the system dimensionality. For quasi-one-dimensional (1D) structures this factor is NCh8g, where NCh and g are, respectively, the number of conducting channels and dimensionless conductance of a normal metal. At voltages above the Thouless energy the interaction correction to Andreev current and shot noise acquires an additional voltage dependence which turns out to be a power-law in the quasi-1D limit.

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  • Received 21 November 2005

DOI:https://doi.org/10.1103/PhysRevB.73.184522

©2006 American Physical Society

Authors & Affiliations

Artem V. Galaktionov and Andrei D. Zaikin

  • Forschungszentrum Karlsruhe, Institut für Nanotechnologie, 76021, Karlsruhe, Germany
  • I.E. Tamm Department of Theoretical Physics, P.N. Lebedev Physics Institute, 119991 Moscow, Russia

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Issue

Vol. 73, Iss. 18 — 1 May 2006

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