Quantum point contact conductance in normal-metal/insulator/metal/superconductor junctions

William J. Herrera, J. Virgilio Niño, and J. Jairo Giraldo
Phys. Rev. B 71, 094515 – Published 29 March 2005

Abstract

The effect of an insulating barrier located at a distance a from a NS quantum point contact is analyzed in this work. The Bogoliubov-de Gennes equations are solved for NINS junctions (S, anisotropic superconductor; I, insulator; and N, normal metal), where the NIN region is a quantum wire. For a0, quasibound states and resonances in the differential conductance are predicted. These resonances depend on the symmetry of the pair potential, the strength of the insulating barrier and a. Our results show that in a NINS quantum point contact the number of resonances vary with the symmetry of the order parameter. This is to be contrasted with the results for the NINS junction, in which only the position of the resonances changes with the symmetry.

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  • Received 12 June 2004

DOI:https://doi.org/10.1103/PhysRevB.71.094515

©2005 American Physical Society

Authors & Affiliations

William J. Herrera*, J. Virgilio Niño, and J. Jairo Giraldo

  • Departamento de Física, Universidad Nacional de Colombia, Bogotá, Colombia

  • *Electronic address: jherreraw@unal.edu.co
  • Electronic address: jvninoc@unal.edu.co
  • Electronic address: jjgiraldog@unal.edu.co

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Issue

Vol. 71, Iss. 9 — 1 March 2005

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