Moir\'e Excitons Correlated with Superlattice Structure in Twisted WSe$_2$/WSe$_2$ Homobilayers

Understand

Moir\'e superlattices in twisted van der Waals materials constitute a promising platform for engineering electronic and optical properties.

• However, a major obstacle to fully understanding these systems and harnessing their potential is the limited ability to correlate the local moir\'e structure with optical properties.
• By using a recently developed scanning electron microscopy technique to image twisted WSe$_2$/WSe$_2$ bilayers, we directly correlate increasing moir\'e periodicity with the emergence of two distinct exciton species.
• These can be tuned individually through electrostatic gating, and feature different valley coherence properties.