Effect of quantum fluctuations on even-odd energy difference in a Cooper-pair box
Superconductivity
2007-06-13 v2 Mesoscale and Nanoscale Physics
Abstract
We study the effect of quantum charge fluctuations on the even-odd energy difference for a small superconducting island (Cooper-pair box) connected to a large finite-size superconductor by a tunnel junction. Even-odd energy difference is important for understanding the quasiparticle "poisoning" effect, and determines the activation energy of a trapped quasiparticle in the Cooper-pair box. We find that renormalization of the activation energy due to quantum charge fluctuations depends on the dimensionless normal-state conductance of the junction g_T, and becomes strong at g_T >> 1.
Keywords
Cite
@article{arxiv.cond-mat/0612473,
title = {Effect of quantum fluctuations on even-odd energy difference in a Cooper-pair box},
author = {R. M. Lutchyn},
journal= {arXiv preprint arXiv:cond-mat/0612473},
year = {2007}
}
Comments
4 pages, 2 figures