Josephson Current through a correlated quantum level: Andreev states and Pi-junction behavior
Condensed Matter
2009-11-07 v1
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.
Cite
@article{arxiv.cond-mat/0212375,
title = {Josephson Current through a correlated quantum level: Andreev states and Pi-junction behavior},
author = {E. Vecino and A. Martin-Rodero and A. Levy Yeyati},
journal= {arXiv preprint arXiv:cond-mat/0212375},
year = {2009}
}