Bound States for a Magnetic Impurity in a Superconductor

Details Bound States for a Magnetic Impurity in a Superconductor Bound States for a Magnetic Impurity in a Superconductor

1998-11-22

arxiv.org/abs/cond-mat/9811312v3

Phys. Rev. B 60 (1999) 615-619

Physics

Condensed Matter

7 pages, Plain TeX

Scientific paper

10.1103/PhysRevB.60.615

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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