Loss of Andreev backscattering in superconducting quantum point contacts

N. B. Kopnin, A. S. Mel’nikov, and V. M. Vinokur
Phys. Rev. B 71, 052505 – Published 22 February 2005

Abstract

We study effects of magnetic field on the quasiparticle energy spectrum in a superconducting quantum point contact. The supercurrent induced by the magnetic field leads to intermode transitions between the electron waves that pass and do not pass through the constriction. The latter experience normal reflections which couple the states with opposite momenta inside the quantum channel and create a minigap in the low-energy spectrum that depends on the magnetic field.

  • Figure
  • Received 30 November 2004

DOI:https://doi.org/10.1103/PhysRevB.71.052505

©2005 American Physical Society

Authors & Affiliations

N. B. Kopnin1,2, A. S. Mel’nikov3,4, and V. M. Vinokur4

  • 1Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Finland
  • 2L. D. Landau Institute for Theoretical Physics, 117940 Moscow, Russia
  • 3Institute for Physics of Microstructures, Russian Academy of Sciences, 603950 Nizhny Novgorod, GSP-105, Russia
  • 4Argonne National Laboratory, Argonne, Illinois 60439, USA

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Issue

Vol. 71, Iss. 5 — 1 February 2005

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