Fig. 1: STM/STS measurement on 54.1° TB-WSe2.
From: Lattice reconstruction induced multiple ultra-flat bands in twisted bilayer WSe2
a Optical image of 54.1° TB-WSe2 sample. The red-dashed box highlights the twisted region. b Top: an atomic-resolution STM topographic image (−1.5 V, 600 pA) of 54.1° TB-WSe2. Bottom: a schematic side view of stacking configurations between two WSe2 layers: O, A, B. Green: Se; Red: W. c dI/dV spectrums (V = − 1.5 V, I = 500 pA, Vmod = 10 mV) near VB edge acquired at the center of four moiré sites. The dashed green (red) curve is the estimated intrinsic v1 (v2) peak from Gaussian fitted peak in region B (A), respectively. d Conductance map taken along the green line in panel b, V = − 1.5 V, I = 1 nA, Vmod = 10 mV. e dI/dV maps at −1.14 V (v1), −1.17 V (v2) and −1.21 V (v3). Scale bar: 2 nm. f Calculated LDOS at four moiré sites, showing the site-dependent peak intensity in moiré lattice. g Calculated electronic band structure plotted in the folded moiré Brillouin zone. Note that the valence band edge is set at E = 0. h Calculated LDOS maps at the energy of v1, v2, and v3, respectively, agree well with experimental results shown in e.
