Fig. 1: Characteristics of MoSe2–WSe2 HBLs in H- and R-type stacking.
From: Excitons in mesoscopically reconstructed moiré heterostructures
a, Schematics of H- and R-type heterostacks with ideal moiré (left) and periodically reconstructed (right) patterns. The coloured regions represent high-symmetry atomic registries, as illustrated in the respective circles. b, Optical micrograph of sample 1 with H- and R-stacks (delimited by dashed lines) of CVD-grown MoSe2 monolayers (small triangles) on a large WSe2 monolayer (large triangle). c, Interlayer exciton PL map (left) with selected bright (H1, R1) and dark (H2, R2) spots indicated by diamonds and circles, respectively, as well as Pc (middle) and Pl (right) maps for the H and R-stacks in b. d,e, Photoluminescence spectra at the bright and dark spots marked in c. At an excitation power of 2 μW, the H1 and R1 spectra are representative for regions with a single bright peak, whereas the H2 and R2 spectra (scaled by 50 and 5, respectively) are characteristics of dark regions with broad and structured PL, which evolves into narrow peaks at a low excitation power of 0.01 μW (scaled by 250 and 25, respectively). All spectroscopy data were recorded on sample 1. f,g, Scanning electron micrographs of H- (f) and R- (g) heterostacks recorded with secondary electron imaging.
