Tuning valley polarization of moire trapped biexcitons by fine structure occupation in WS₂/WSe₂ heterostructures.

ABSTRACT: Two-dimensional transition metal dichalcogenides (TMDs) heterostructures formed moiré superlattices have emerged as a new platform for exploring correlated excitonic states and valleytronic phenomena. Despite the significant progress in moiré-trapped single excitons, the valley polarization and fine structure of moiré-trapped biexcitons remain poorly understood, with the existing studies reporting only limited or zero polarization and lacking insight into the underlying mechanisms. Here, we study the moiré-trapped interlayer biexcitons in WS₂/WSe₂ heterostructures through power- and temperature-dependent photoluminescence (PL) spectroscopy. We find that the valley polarization of these biexcitons can be effectively tuned, reaching ~ 55% at 120 K. This behavior is attr

SUBMITTER: Jiang Y 

PROVIDER: S-EPMC12852937 | biostudies-literature | 2025 Dec

REPOSITORIES: biostudies-literature