Fig. 3: Quasi-particle interference imaging of the V kagome and ScSn₂ surfaces.

a, c FT-STS image near the Fermi level for V kagome and ScSn₂ surfaces, respectively. The real-space image was acquired over a 150 nm field of view. Green and red dots mark the positions of Bragg and CDW peaks, respectively. The blue circle highlights the prominent QPI spots surrounding the CDW peaks. b Schematic drawing of the QPI features shown in a. The most prominent QPI features (at a momentum q_s indicated by the pink arrow) are 3-fold symmetric with respect to the CDW peaks. Other features surrounding the Bragg peaks are discussed in the Supplementary Fig. 6. d–m QPI images taken at different energies as indicated in each panel for V kagome surface. n Zoomed-in view of the region in Box 1 of panel a at different energies. It is clearly seen that q_s (labeled by the pink arrow in b) is highly dispersive and merges into the static CDW peaks at E ~ − 30 meV in (n). The color scale in each image has been adjusted independently for visualization. STM setup (V_sample, I_set, V_exc,) conditions for each panel: a, (−2.5 mV, 110 pA, 1 mV); c, (-5 mV, 120 pA, 2 mV); d, (20 mV, 125 pA, 2 mV); e, (15 mV, 120 pA, 2 mV); f, (10 mV, 110 pA, 2 mV); g, (5 mV, 110 pA, 1 mV); h, (−5 mV, 115 pA, 1 mV); i, (−10 mV, 120 pA, 2 mV); j, (−15 mV, 120 pA, 2 mV); k, (−20 mV, 130 pA, 1 mV); l, (−25 mV, 145 pA, 2.5 mV); m, (−30 mV, 140 pA, 1 mV). For zoom in data shown at other energies in n, STM setup conditions are listed in the Supplementary Fig. 6.