Theory of quasiparticle interference in mirror-symmetric two-dimensional systems and its application to surface states of topological crystalline insulators

被引：30

作者：

Fang, Chen ^{[1
,2
]}

Gilbert, Matthew J. ^{[3
,4
]}

Xu, Su-Yang ^{[2
]}

Bernevig, B. Andrei ^{[2
]}

Hasan, M. Zahid ^{[2
]}

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[2] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA

[3] Univ Illinois, Dept Elect & Comp Engn, Urbana, IL 61801 USA

[4] Univ Illinois, Micro & Nanotechnol Lab, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 12期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevB.88.125141

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study symmetry-protected features in the quasiparticle interference (QPI) pattern of two-dimensional (2D) systems with mirror symmetries and time-reversal symmetry, around a single static point impurity. We show that, in the Fourier-transformed local density of states (FT-LDOS) rho(q,omega), while the position of high-intensity peaks generically depends on the geometric features of the iso-energy contour at energy omega, the absence of certain peaks is guaranteed by the opposite mirror eigenvalues of the two Bloch states that are (i) on the mirror-symmetric lines in the Brillouin zone (BZ) and (ii) separated by scattering vector q. We apply the general result to the QPI on the < 001 > surface of the topological crystalline insulator Pb1-xSnx Te and predict all vanishing peaks in rho(q,omega). The model-independent analysis is supported by numerical calculations using an effective four-band model derived from symmetry analysis.

引用

页数：8

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