Spontaneous gap generation on the surface of weakly interacting topological insulators using nonmagnetic impurities

被引：14

作者：

Black-Schaffer, Annica M. ^{[1
]}

Yudin, Dmitry ^{[1
]}

机构：

[1] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 16期

基金：

瑞典研究理事会;

关键词：

D O I：

10.1103/PhysRevB.90.161413

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Strong nonmagnetic impurities on the surface of three-dimensional topological insulators (TIs) generate localized resonance peaks close to the Dirac point. We show that this results in a strongly reduced critical Coulomb interaction strength to reach a magnetic surface state, following a Stoner-like criterion. Thus even weakly interacting TIs host a finite (local) magnetization around strong nonmagnetic impurities. The local magnetization gives rise to a global energy gap, linearly dependent on the maximum value of the magnetization but decreasing with reduced impurity concentration.

引用

页数：5

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