Josephson current through a correlated quantum level: Andreev states and π junction behavior
E. Vecino, A. Martín-Rodero, A. Levy Yeyati
DOI 10.1103/PhysRevB.68.035105 · Physical Review B
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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 bandwidth limit. The system exhibits a rich behavior as a function of the relevant parameters. We discuss in detail the conditions for the observation of π junction behavior and the effect of Coulomb interactions on the Andreev states.
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