Interplay between exchange interactions and charging effects in metallic grains
Mesoscale and Nanoscale Physics
2007-05-23 v2
Abstract
We study the effect of the exchange interactions in small superconducting grains near the Coulomb blockade regime. We extend the standard description of the grain in terms of a single collective variable, the charge and its conjugated phase, to include the spin degree of freedom. The suppression of spin fluctuations enhances the tendency towards Coulomb blockade. The effective charging energy and conductance are calculated numerically in the regime of large grain-lead coupling.
Cite
@article{arxiv.cond-mat/0401557,
title = {Interplay between exchange interactions and charging effects in metallic grains},
author = {Pablo San-Jose and Carlos P. Herrero and Francisco Guinea and Daniel P. Arovas},
journal= {arXiv preprint arXiv:cond-mat/0401557},
year = {2007}
}
Comments
4 pages, 3 figures. Some updates to references, and a new introduction have been included