Optimal inhomogeneity for superconductivity

被引：27

作者：

Arrigoni, E ^{[1
]}

Kivelson, SA

机构：

[1] Univ Calif Los Angeles, Dept Phys, Los Angeles, CA 90095 USA

[2] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany

来源：

PHYSICAL REVIEW B | 2003年 / 68卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.68.180503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 towards phase coherence. The optimal conditions for superconductivity are derived. We also show that a delocalized, spin-gapped phase is stable against weak disorder in a four-leg ladder with moderate repulsive interactions.

引用

页数：4

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