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|Abstract:||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.|
|Citation:||Fang, Chen, Gilbert, Matthew J, Xu, Su-Yang, Bernevig, B Andrei, Hasan, M Zahid. (2013). Theory of quasiparticle interference in mirror-symmetric two-dimensional systems and its application to surface states of topological crystalline insulators. PHYSICAL REVIEW B, 88 (10.1103/PhysRevB.88.125141|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||PHYSICAL REVIEW B|
|Version:||Final published version. Article is made available in OAR by the publisher's permission or policy.|
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