journal article·2023-04

Strong Interlayer Coupling in Twisted Transition Metal Dichalcogenide Moiré Superlattices

Haihong Zheng, Hongli Guo, Shula Chen, Biao Wu, Shaofei Li, Jun He, Zongwen Liu, Gang Lu, Xidong Duan, Anlian Pan, Yanping Liu

Advanced Materials· Volume 35· Issue 16
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Abstract

Abstract Moiré superlattices in twisted van der Waals materials offer a powerful platform for exploring light–matter interactions. The periodic moiré potentials in moiré superlattices can induce strongly correlated quantum phenomena that depend on the moiré potential associated with interlayer coupling at the interface. However, moiré superlattices are primarily prepared by mechanical exfoliation and manual stacking, where the transfer methods easily cause interfacial contamination, and the preparation of high‐quality bilayer 2D materials with small twist angles by growth methods remains a significant challenge. In this work, WSe2/WSe2 homobilayers with different twist angles by chemical vapor deposition (CVD), using a heteroatom‐assisted growth technique, are synthesized. Using low‐frequency Raman scattering, the uniformity of the moiré superlattices is mapped to demonstrate the strong interfacial coupling of the CVD‐fabricated twist‐angle homobilayers. The moiré potential depths of the CVD‐grown and artificially stacked homostructures with twist angles of 1.5° are 115 and 45 meV (an increase of 155%), indicating that the depth of moiré potential can be modulated by the interfacial coupling. These results open a new avenue to study the modulation of moiré potential by strong interlayer coupling and provide a foundation for the development of twistronics.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Strong Light-Matter Interactions

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Affiliations

School of Physics and Electronics Hunan Key Laboratory for Super‐microstructure and Ultrafast Process Central South University 932 South Lushan Road Changsha Hunan 410083 P. R. China

Department of Physics and Astronomy California State University Northridge California CA 91330–8268 USA

Hunan Institute of Optoelectronic Integration College of Materials Science and Engineering Hunan University Changsha Hunan 410082 P. R. China

School of Chemical and Biomolecular Engineering The University of Sydney Camperdown NSW 2006 Australia

The University of Sydney Nano Institute The University of Sydney Camperdown NSW 2006 Australia

Hunan Key Laboratory of 2D Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan University Changsha P. R. China

State Key Laboratory of High‐Performance Complex Manufacturing Central South University 932 South Lushan Road Changsha Hunan 410083 P. R. China

Shenzhen Research Institute of Central South University Shenzhen 51800 P. R. China

Funding

Australian Research Council · National Natural Science Foundation of China

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