The optimal inhomogeneity for superconductivity
Strongly Correlated Electrons
2016-08-31 v1 Superconductivity
Abstract
We study the effect of nonuniform transverse couplings on a quasi-one dimensional superconductor. We show that inhomogeneous couplings quite generally increase the superconducting (pairing) gap relative to the uniform system, but that beyond an ``optimal'' degree of inhomogeneity, they lead to a suppression of the tendency to phase coherence. The optimal conditions for superconductivity are derived. We also show that a {\it delocalized}, spin-gapped phase is stable against weak disorder in a four-leg-ladder with moderate repulsive interactions.
Cite
@article{arxiv.cond-mat/0212256,
title = {The optimal inhomogeneity for superconductivity},
author = {E. Arrigoni and S. A. Kivelson},
journal= {arXiv preprint arXiv:cond-mat/0212256},
year = {2016}
}
Comments
5 pages revtex4, 1 .eps figure