Scale-dependent competing interactions: sign reversal of the average persistent current
Mesoscale and Nanoscale Physics
2013-05-30 v2
Abstract
The interaction-induced orbital magnetic response of a nanoscale system, modeled by the persistent current in a ring geometry, is evaluated for a system which is a superconductor in the bulk. The interplay of the renormalized Coulomb and Fr\"{o}hlich interactions is crucial. The diamagnetic response of the large superconductor may become paramagnetic when the finite-size-determined Thouless energy is larger than or on the order of the Debye energy.
Cite
@article{arxiv.1210.2851,
title = {Scale-dependent competing interactions: sign reversal of the average persistent current},
author = {H. Bary-Soroker and O. Entin-Wohlman and Y. Imry and A. Aharony},
journal= {arXiv preprint arXiv:1210.2851},
year = {2013}
}
Comments
4 pages, 4 figures, references added minor modifications