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The Anderson model in a superconductor: -derivable theory

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Published under licence by IOP Publishing Ltd
, , Citation Ari T Alastalo et al 1998 J. Phys.: Condens. Matter 10 L63 DOI 10.1088/0953-8984/10/3/003

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Author affiliations

1 Materials Physics Laboratory, PO Box 2200 (Technical Physics), Helsinki University of Technology, FIN-02015 HUT, Finland

2 Department of Physics and Applied Superconductivity Center, University of Wisconsin - Madison, Madison, WI 53706, USA

Dates

  1. Received 11 November 1997

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0953-8984/10/3/L63

Abstract

We introduce a new -derivable approach for the Anderson impurity model in a BCS superconductor. The regime of validity of this conserving theory extends well beyond that of the Hartree - Fock approximation. This is the first generalization of the U-perturbation theory to encompass a superconductor.

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10.1088/0953-8984/10/3/003