pi-Junction behavior and Andreev bound states in Kondo quantum dots with superconducting leads
Abstract
We investigate the temperature- and coupling-dependent transport through Kondo dot contacts with symmetric superconducting s-wave leads. For finite temperature T we use a superconducting extension of a selfconsistent auxiliary boson scheme, termed SNCA, while at T=0 a perturbative renormalization group treatment is applied. The finite-temperature phase diagram for the 0--pi transition of the Josephson current in the junction is established and related to the phase-dependent position of the subgap Kondo resonance with respect to the Fermi energy. The conductance of the contact is evaluated in the zero-bias limit. It approaches zero in the low-temperature regime, however, at finite T its characteristics are changed through the coupling- and temperature-dependent 0--pi transition.
Keywords
Cite
@article{arxiv.cond-mat/0504649,
title = {pi-Junction behavior and Andreev bound states in Kondo quantum dots with superconducting leads},
author = {Gabriel Sellier and Thilo Kopp and Johann Kroha and Yuri S. Barash},
journal= {arXiv preprint arXiv:cond-mat/0504649},
year = {2007}
}
Comments
12 pages, 12 figures