Andreev Scattering and the Kondo Effect

Details Andreev Scattering and the Kondo Effect Andreev Scattering and the Kondo Effect

1999-01-21

arxiv.org/abs/cond-mat/9901205v3

Phys. Rev. B 61, 3555 (2000).

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 7 figures; expanded version to appear in PRB

Scientific paper

10.1103/PhysRevB.61.3555

We examine the properties of an infinite-$U$ Anderson impurity coupled to both normal and superconducting metals. Both the cases of a quantum dot and a quantum point contact containing an impurity are considered; for the latter, we study both one and two-channel impurities. Using a generalization of the noncrossing approximation which incorporates multiple Andreev reflection, we compute the impurity spectral function and the linear-response conductance of these devices. We find generically that the Kondo resonance develops structure at energies corresponding to the superconducting gap, and that the magnitude of the resonance at the Fermi energy is altered. This leads to observable changes in the zero-bias conductance as compared to the case with no superconductivity.

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