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Bound States for a Magnetic Impurity in a Superconductor

Z. S. Bassi·A. LeClair
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Abstract

We discuss a solvable model describing an Anderson like impurity in a BCS superconductor. The model can be mapped onto an Ising field theory in a boundary magnetic field, with the Ising fermions being the quasi-particles of the Bogoliubov transformation in BCS theory. The reflection S-matrix exhibits Andreev scattering, and the existence of bound states of the quasi-particles with the impurity lying inside the superconducting gap.

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Z. S. Bassi, A. LeClair. 1999-08-15. Bound States for a Magnetic Impurity in a Superconductor. https://doi.org/10.1103/physrevb.60.615

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