We investigate the spin-flip effects on the Andreev bound states and the supercurrent in a superconductor/quantum-dot/superconductor system theoretically. The spin-flip scattering in the quantum dot can reverse the supercurrent flowing through the system, and one π-junction transition occurs. By controlling the energy level of quantum dot, the supercurrent is reversed back and another π-junction transition appears. The different influences of the spin-flip scattering and the intradot energy level on the supercurrent are interpreted in the picture of Andreev bound states.
@article{arxiv.cond-mat/0503636,
title = {Spin-flip effects on the Andreev bound states and supercurrents in a superconductor/quantum-dot/superconductor system},
author = {Hui Pan and Tsung-Han Lin and Dapeng Yu},
journal= {arXiv preprint arXiv:cond-mat/0503636},
year = {2007}
}