Correlation-induced conductance suppression at level degeneracy in a quantum dot
Abstract
The large, level-dependent g-factors in an InSb nanowire quantum dot allow for the occurrence of a variety of level crossings in the dot. While we observe the standard conductance enhancement in the Coulomb blockade region for aligned levels with different spins due to the Kondo effect, a vanishing of the conductance is found at the alignment of levels with equal spins. This conductance suppression appears as a canyon cutting through the web of direct tunneling lines and an enclosed Coulomb blockade region. In the center of the Coulomb blockade region, we observe the predicted correlation-induced resonance, which now turns out to be part of a larger scenario. Our findings are supported by numerical and analytical calculations.
Cite
@article{arxiv.0911.2060,
title = {Correlation-induced conductance suppression at level degeneracy in a quantum dot},
author = {H. A. Nilsson and O. Karlström and M. Larsson and P. Caroff and J. N. Pedersen and L. Samuelson and A. Wacker and L. E. Wernersson and H. Q. Xu},
journal= {arXiv preprint arXiv:0911.2060},
year = {2010}
}
Comments
5 pages, 4 figures