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Research Article

Evidence for interlayer coupling and moiré excitons in twisted WS2/WS2 homostructure superlattices

Haihong Zheng1,2, Biao Wu1,2, Shaofei Li1, Jun He1, Keqiu Chen3, Zongwen Liu4,5, Yanping Liu1,2,6 ( )
School of Physics and Electronics, Hunan Key Laboratory for Super-microstructure and Ultrafast Process, Central South University, Changsha 410083, China
State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China
Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China
School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
The University of Sydney Nano Institute, The University of Sydney, NSW 2006, Australia
Shenzhen Research Institute of Central South University, Shenzhen 518000, China
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Graphical Abstract

Modulation of moire potential and intralayer excitons in the twisted homobilayer WS2/WS2 has been demonstrated. There findings provide insights for an in-depth understanding of the behaviors of moiré excitons in the twisted van der Waals homostructure superlattices.

Abstract

The formation of moiré superlattices in twisted van der Waals (vdW) homostructures provides a versatile platform for designing the electronic band structure of two-dimensional (2D) materials. In graphene and transition metal dichalcogenides (TMDs) moiré systems, twist angle has been shown to be a key parameter for regulating the moiré superlattice. However, the effect of the modulation of the twist angle on moiré potential and interlayer coupling has not been the subject of experimental investigation. Here, we report the observation of the modulation of moiré potential and intralayer excitons in the WS2/WS2 homostructure. By accurately adjusting the torsion angle of the homobilayers, the depth of the moiré potential can be modulated. The confinement effect of the moiré potential on the intralayer excitons was further demonstrated by the changing of temperature and valley polarization. Furthermore, we show that a detection of atomic reconstructions by the low-frequency Raman mapping to map out inhomogeneities in moiré lattices on a large scale, which endows the uniformity of interlayer coupling. Our results provide insights for an in-depth understanding of the behaviors of moiré excitons in the twisted van der Waals homostructure, and promote the study of electrical engineering and topological photonics.

Keywords

moiré superlatticesmoiré excitonsinterlayer couplingmoiré potential

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Nano Research
Volume 16 Issue 2,
February 2023
Pages 3429-3434
DOI: 10.1007/s12274-022-4964-4
Cite this article:
Zheng H, Wu B, Li S, et al. Evidence for interlayer coupling and moiré excitons in twisted WS2/WS2 homostructure superlattices. Nano Research, 2023, 16(2): 3429-3434. https://doi.org/10.1007/s12274-022-4964-4
Topics:
Layered semiconductors

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Received: 09 June 2022
Revised: 26 July 2022
Accepted: 24 August 2022
Published: 27 September 2022
© Tsinghua University Press 2022
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