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Physical Review B
We study symmetry protected features in the quasiparticle interference (QPI) pattern of 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), ρ(,ω), while the position of high intensity peaks generically depends on the geometric features of the iso-energy contour at energy ω, the absence of certain peaks is guaranteed by the opposite mirror eigenvalues of the two Blochdoi:10.1103/physrevb.88.125141 fatcat:62zs2mxrzzd53b2h4psxxaojiq