Weak Charge Quantization on Superconducting Islands
介观与纳米尺度物理
2009-11-07 v1 超导电性
摘要
We consider the Coulomb blockade on a superconductive quantum dot strongly coupled to a lead through a tunnelling barrier and/or normal diffusive metal. Andreev transport of the correlated pairs leads to quantum fluctuations of the charge on the dot. These fluctuations result in exponential renormalization of the effective charging energy. We employ two complimentary ways to approach the problem, leading to the coinciding results: the instanton and the functional RG treatment of the non-linear sigma model. We also derive the charging energy renormalization in terms of arbitrary transmission matrix of the multi-channel interface.
引用
@article{arxiv.cond-mat/0203586,
title = {Weak Charge Quantization on Superconducting Islands},
author = {M. V. Feigelman and A. Kamenev and A. I. Larkin and M. A. Skvortsov},
journal= {arXiv preprint arXiv:cond-mat/0203586},
year = {2009}
}
备注
21 pages, 4 eps figures, RevTeX