Nonvolatile electrical switching of optical and valleytronic properties of interlayer excitons.

ABSTRACT: Long-lived interlayer excitons (IXs) in van der Waals heterostructures (HSs) stacked by monolayer transition metal dichalcogenides (TMDs) carry valley-polarized information and thus could find promising applications in valleytronic devices. Current manipulation approaches for valley polarization of IXs are mainly limited in electrical field/doping, magnetic field or twist-angle engineering. Here, we demonstrate an electrochemical-doping method, which is efficient, in-situ and nonvolatile. We find the emission characteristics of IXs in WS₂/WSe₂ HSs exhibit a large excitonic/valley-polarized hysteresis upon cyclic-voltage sweeping, which is ascribed to the chemical-doping of O₂/H₂O redox couple trapped between WSe₂ and substrate. Taking

SUBMITTER: Ye T 

PROVIDER: S-EPMC8786835 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature