Anderson Model in a Superconductor: $Φ$-Derivable Theory

Details Anderson Model in a Superconductor: $Φ$-Derivable Theory Anderson Model in a Superconductor: $Φ$-Derivable Theory

1997-12-11

arxiv.org/abs/cond-mat/9712118v1

J. Phys.: Condens. Matter 10 (1998) L63-L68

Physics

Condensed Matter

Superconductivity

11 pages and 4 figures. Accepted for publication in Journal of Physics: Condensed Matter as a Letter to the Editor

Scientific paper

10.1088/0953-8984/10/3/003

We introduce a new $\Phi $-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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