Robust Interlayer Exciton in WS2/MoSe2van der Waals Heterostructure under High Pressure

Xiaoli Ma, Shaohua Fu, Jianwei Ding, Meng Liu, Ang Bian, Fang Hong*, Jiatao Sun*, Xiaoxian Zhang*, Xiaohui Yu*, Dawei He

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

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 WS2/MoSe2 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 WS2/MoSe2 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 WS2/MoSe2, which could be of great importance for the material and device design in various similar quantum systems.

Original languageEnglish
Pages (from-to)8035-8042
Number of pages8
JournalNano Letters
Volume21
Issue number19
DOIs
Publication statusPublished - 13 Oct 2021

Keywords

  • band structure
  • electronic coupling
  • high pressure engineering
  • interlayer exciton
  • van der Waals heterostructures

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