Fig. 5: Intralayer and interlayer excitons valley polarization in WSe2/WSe2 twisted homobilayer.
From: Evidence for moiré intralayer excitons in twisted WSe2/WSe2 homobilayer superlattices
a Illustration of the valley optical selection rule, where the blue (red) sphere indicates electrons (holes) in the conduction (valence) band. The arrow represents spin up or down. The red (blue) wavy arrow indicates the emitted σ− (σ+) light. b illustration of interlayer excitons transition in the twisted WSe2/WSe2 homobilayer. The red and gray dashed double arrows indicate the radiative recombination of the interlayer excitons IX1 and IX2. c and d represent the circularly polarized PL spectra in the T-HB region under σ− and σ+ excitation, respectively. e and f are the circularly polarized PL spectra of interlayer excitons under σ− and σ+ excitation, respectively. The interlayer excitons appear opposite circular polarization. σxσy shows excitation with σx pump and detection with σy circular polarization. The measured temperature in (c–f) is 8 K
