Twisted-angle dependent exciton in heterobilayer of transition metal dichalcogenides

The type-II band structures in vertically stacked transition metal dichalcogenides (TMDs) heterobilayers facilitate the formation of interlayer excitons. The twist-angle and the mismatch in the lattice constants of the monolayers create a periodic moiré potential as deep as >100 meV, which can affect the optical bandgap and the optical selection rules of the forming excitons. Identifying the origin of the exciton peaks in TMDs heterobilayers is sometimes controversial because their similar energies.


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