Fig. 1
From: Negative circular polarization emissions from WSe2/MoSe2 commensurate heterobilayers
WSe2/MoSe2 hBLs with AA and AB stacking. a, b Optical images of hBLs with AA (a) and AB (b) stacking. The scale bar is 3 μm. c, d Schematics of heterostructures shown in a and b, respectively. e, f SHG intensity mapping for the hBLs with AA (e) and AB (f) stacking. The scale bar is 3 μm. g, h ADF STEM images of the hBLs with AA (g) and AB (h) stacking. The insets are filtered images. The scale bar is 0.5 nm. i, j Schematics of the top and side views of the atomic registries of AA (i) and AB (j) stacking, according to the ADF STEM results. The AA stacking corresponds to the 3R-like stacking (i), with Se atoms of WSe2 on top of Mo atoms of MoSe2. The AB stacking corresponds to the 2H-like stacking (j), with W (Se) atoms of WSe2 on top of Se (Mo) atoms of MoSe2 layer
