Fig. 2: Twist-angle dependence of the hybrid excitons.
From: Twist-angle dependence of moiré excitons in WS2/MoSe2 heterobilayers
a RC spectra of bilayers of different twist angles θi, for i = 1–6. The corresponding θi and extracted detuning δi = EIX,i − EX,i are labeled by each spectrum. The spectra are displaced vertically for easier reading. b Schematics of MoA intralayer (red) and interlayer (blue) exciton bands at the different twist angles θi. The interlayer exciton band is displaced in the momentum space with increasing θi. The moiré superlattice leads to band folding and formation of a new interlayer exciton state at the Γ point q = 0 (blue oval), with the same angular momentum as the intralayer exciton state (red oval). c Ratio of the oscillator strengths of LHXMoA and UHXMoA, detuning, and inter- and intralayer exciton coupling strength as a function of the twist angle θ, obtained from the RC spectra. The gray solid lines in the middle panel are quadratic fits based on Eq. (1). The blue solid lines in the bottom panel are the theoretical values based on Eq. (2).
