Coulomb blockade and Non-Fermi-liquid behavior in quantum dots
Abstract
The non-Fermi-liquid properties of an ultrasmall quantum dot coupled to a lead and to a quantum box are investigated. Tuning the ratio of the tunneling amplitudes to the lead and box, we find a line of two-channel Kondo fixed points for arbitrary Coulomb repulsion on the dot, governing the transition between two distinct Fermi-liquid regimes. The Fermi liquids are characterized by different values of the conductance. For an asymmetric dot, spin and charge degrees of freedom are entangled: a continuous transition from a spin to a charge two-channel Kondo effect evolves. The crossover temperature to the two-channel Kondo effect is greatly enhanced away from the local-moment regime, making this exotic effect accessible in realistic quantum-dot devices.
Cite
@article{arxiv.cond-mat/0311502,
title = {Coulomb blockade and Non-Fermi-liquid behavior in quantum dots},
author = {Frithjof B. Anders and Eran Lebanon and Avraham Schiller},
journal= {arXiv preprint arXiv:cond-mat/0311502},
year = {2007}
}
Comments
5 figures