Fig. 1: Optical properties of moiré superlattice in twisted homobilayer.
From: Evidence for moiré intralayer excitons in twisted WSe2/WSe2 homobilayer superlattices
a Schematic depiction of the moiré superlattice structure generated by the WSe2 bilayer with a twist angle of θ, where aM is the moiré potential period. b The moiré superlattice results in periodic modulation of the electrostatic potential in the twisted homobilayer, which can trap excitons in the periodic potential. c The formation of the moiré unit cell in the twisted homobilayer causes the formation of the moiré Brillouin zone. d Optical image of the WSe2/WSe2 twisted homobilayer placed on hexagonal boron nitride (hBN). The bottom WSe2 and top WSe2 monolayer regions are represented by red and blue dashed lines, respectively. e Measured and fitted the SHG signals of the WSe2 monolayer area on the top and bottom of the sample to determine that the twist angle between the WSe2 bilayers is close to zero
