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Josephson Current through a correlated quantum level: Andreev states and Pi-junction behavior

E. Vecino·A. Martin-Rodero·A. Levy Yeyati
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Abstract

The Josephson transport and the electronic properties of a quantum dot characterized by a single level coupled to superconducting leads is analyzed. Different approximations are used and compared: the mean field approximation, the second order perturbation theory in the Coulomb interaction and the exact diagonalization in the zero band-width limit. The system exhibits a rich behavior as a function of the relevant parameters. We discuss in detail the conditions for the observation of Pi-junction behavior and the effect of Coulomb interactions on the Andreev states.

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E. Vecino, A. Martin-Rodero, A. Levy Yeyati. 2002-12-16. Josephson Current through a correlated quantum level: Andreev states and Pi-junction behavior. https://doi.org/10.1103/physrevb.68.035105

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