Disorder driven superconductor-insulator transition in inhomogenous d-wave superconductor

被引：1

作者：

Sun, Jian ^{[1
]}

He, Long ^{[1
]}

Zhao, YangYang ^{[1
]}

Song, Yun ^{[1
]}

机构：

[1] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China

来源：

SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY | 2016年 / 59卷 / 01期

基金：

中国国家自然科学基金;

关键词：

superconductor-insulator transition; effect of disorder; d-wave superconductor; SCATTERING;

D O I：

10.1007/s11433-015-5713-4

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the effect of disorder on the superconductor-insulator transition in an inhomogeneous d-wave superconductor using the kernel polynomial method. As the Bogoliubov-de Gennes equations of the two-dimensional square lattice are solved self-consistently for the cases with more than 100000 unit cells, it is possible to observe the spatial fluctuations of the superconducting order parameters at the nanoscale. We find that strong spatial fluctuation of the superconducting order parameters can be introduced by disorder, and some superconducting specific order parameters are even enhanced. Moreover, we find that some isolated superconducting "islands" can survive the strong disorder, giving a boson insulator with some localized Cooper pairs. Our numerical calculations predict the existence of two sequential transitions with the increasing disorder strength: a d-wave to s-wave superconductor transition, and then an s-wave superconductor to insulator transition. The possibility of the appearance of a metallic phase between the superconducting and insulating phases is excluded by performing the lattice-size scaling of the generalized inverse participation ratio. In addition, we also discuss the effect of disorder on the optical conductivity of the d-wave superconductors.

引用

页码：1 / 6

页数：6

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