Non-Crossing Approximation Study of Multi-Orbital Kondo Effect in Quantum Dot Systems
Abstract
We study the three-orbital Kondo effect in quantum dot (QD) systems by applying the non-crossing approximation to the three-orbital Anderson impurity model. By investigating the tunneling conductance through a QD, we show that the competition between the Hund-coupling and the orbital level-splitting gives rise to characteristic behavior in transport properties. It is found that the Hund-coupling becomes more important in the three-orbital case than in the two-orbital case. We also show that the enhancement of Kondo temperature due to the singlet-triplet mechanism suggested for the two-orbital model tends to be suppressed by the existence of the third orbital.
Cite
@article{arxiv.cond-mat/0605285,
title = {Non-Crossing Approximation Study of Multi-Orbital Kondo Effect in Quantum Dot Systems},
author = {Tomoko Kita and Rui Sakano and Takuma Ohashi and Sei-ichiro Suga},
journal= {arXiv preprint arXiv:cond-mat/0605285},
year = {2007}
}
Comments
6 pages, 5 figures, submitted to the Proceedings of the International Symposium on Mesoscopic Superconductivity and Spintronics 2006 (MS+S2006)