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Andreev levels in a single-channel conductor.

Titov, M. and Mortensen, N. A. and Schomerus, H. and Beenakker, C. W. J. (2001) Andreev levels in a single-channel conductor. Physical Review B, 64. p. 134206.

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    Abstract

    We calculate the subgap density of states of a disordered single-channel normal metal connected to a superconductor at one end (normal-metal�superconductor junction) or at both ends [superconductor�normal-metal�superconductor (SNS) junction]. The probability distribution of the energy of a bound state (Andreev level) is broadened by disorder. In the SNS case the twofold degeneracy of the Andreev levels is removed by disorder leading to a splitting in addition to the broadening. The distribution of the splitting is given precisely by Wigner�s surmise from random-matrix theory. For strong disorder the mean density of states is largely unaffected by the proximity to the superconductor, because of localization, except in a narrow energy region near the Fermi level, where the density of states is suppressed with a log-normal tail.

    Item Type: Article
    Journal or Publication Title: Physical Review B
    Subjects: UNSPECIFIED
    Departments: Faculty of Science and Technology > Physics
    ID Code: 687
    Deposited By: Dr Henning Schomerus
    Deposited On: 31 Oct 2007
    Refereed?: Yes
    Published?: Published
    Last Modified: 26 Jul 2012 18:18
    Identification Number:
    URI: http://eprints.lancs.ac.uk/id/eprint/687

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