Robust Interlayer Exciton in WS<sub>2</sub>/MoSe<sub>2</sub> van der Waals Heterostructure under High Pressure.
basic_science · Level V
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- Record sourced from PubMed, PMID 34605657.
- Also identified by DOI 10.1021/acs.nanolett.1c02281.
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Abstract
The van der Waals (vdW) heterostructures have rich functions and intriguing physical properties, which has attracted wide attention. Effective control of excitons in vdW heterostructures is still urgent for fundamental research and realistic applications. Here, we successfully achieved quantitative tuning of the intralayer exciton of monolayers and observed the transition from intralayer excitons to interlayer excitons in WS<sub>2</sub>/MoSe<sub>2</sub> heterostructures, via hydrostatic pressure. The energy of interlayer excitons is in a "locked" or "superstable" state, which is not sensitive to pressure. The first-principles calculation reveals the stronger interlayer interaction which leads to enhanced interlayer exciton behavior in WS<sub>2</sub>/MoSe<sub>2</sub> heterostructures under external pressure and reveals the robust peak of interlayer excitons. This work provides an effective strategy to study the interlayer interaction in vdW heterostructures and reveals the enhanced interlayer excitons in WS<sub>2</sub>/MoSe<sub>2</sub>, which could be of great importance for the material and device design in various similar quantum systems.