Polarization and Charge-Separation of Moire Excitons in van der Waals Heterostructures.

ABSTRACT: Twisted transition metal dichalcogenide (TMD) bilayers exhibit periodic moiré potentials, which can trap excitons at certain high-symmetry sites. At small twist angles, TMD lattices undergo an atomic reconstruction, altering the moiré potential landscape via the formation of large domains, potentially separating the charges in-plane and leading to the formation of intralayer charge-transfer (CT) excitons. Here, we employ a microscopic, material-specific theory to investigate the intralayer charge-separation in atomically reconstructed MoSe₂-WSe₂ heterostructures. We identify three distinct and twist-angle-dependent exciton regimes including localized Wannier-like excitons, polarized excitons, and intralayer CT excitons. We calculate the moiré site hopping for these ex

SUBMITTER: Hagel J 

PROVIDER: S-EPMC11583365 | biostudies-literature | 2024 Nov

REPOSITORIES: biostudies-literature