Identification of twist-angle-dependent excitons in WS₂/WSe₂ heterobilayers.

ABSTRACT: Stacking atomically thin films enables artificial construction of van der Waals heterostructures with exotic functionalities such as superconductivity, the quantum Hall effect, and engineered light-matter interactions. In particular, heterobilayers composed of monolayer transition metal dichalcogenides have attracted significant interest due to their controllable interlayer coupling and trapped valley excitons in moiré superlattices. However, the identification of twist-angle-modulated optical transitions in heterobilayers is sometimes controversial since both momentum-direct (K-K) and -indirect excitons reside on the low energy side of the bright exciton in the monolayer constituents. Here, we attribute the optical transition at ∼1.35 eV in the WS₂/WSe₂ heterobilayer

SUBMITTER: Wu K 

PROVIDER: S-EPMC9252742 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature