Fig. 4: Edge bands and QPI pattern.
From: Backscattering in topological edge states despite time-reversal symmetry
a Tight-binding slab calculations (gray) of indenene flat edges with flat edge A localized bands color-coded according to their 〈sz〉 character. For clarity, selected bulk bands (black) indicate valence and conduction band onsets with the bulk band gap Egap marked in red. Further indicated for flat edge A are the number of Kramers pairs (blue) in a given energy interval as well as exemplary TRS-allowed backscattering momentum transfers q. b Energy-dependent momentum JDOS E(q) of q involved in scattering processes that are facilitated by the dispersion of flat edge A, for details see Supplementary Discussion III. Data points are extracted from experimentally observed resonator oscillations (see 2π/q in Fig. 3c) and offset to compensate for the experimental n-doping, using the valence band maximum (VBM) as a reference point, see “Method” section. Each color represents one edge segment. c Modulus of fast Fourier transform of segment 2 in Fig. 3b showing q related spectral weight, QPI suppression (dashed lines) and onset of QPI at positive bias voltages. d Calculation of momentum JDOS E(q) associated with flat edge B bands. Experimental data points are extracted from flat edge B segments similar to (b). The colorbar in (b, d, c) represents the momentum JDOS and the squared modulus of the FFT, respectively.
