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Nano Research 2023, 16(2): 3435-3442 https://doi.org/10.1007/s12274-022-5007-x
Research Article | Issue | Published: 07 October 2022

Effect of layered-coupling in twisted WSe2 moiré superlattices

Show Author's Information Biao Wu1,2,  Haihong Zheng1,2,  Shaofei Li1,  Chang-Tian Wang3,4,  Junnan Ding1,  Jun He1,  Zongwen Liu5,6,  Jian-Tao Wang3,4,7( ),  Yanping Liu1,2,8( )
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
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, 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
Songshan Lake Materials Laboratory, Dongguan 523808, China
Shenzhen Research Institute of Central South University, Shenzhen 518000, China
Keywords:
moiré superlattices, moiré potential, twisted homostructures, layer-coupling
Topics:
Layered semiconductors
Cite this article:
Wu B, Zheng H, Li S, et al. Effect of layered-coupling in twisted WSe2 moiré superlattices. Nano Research, 2023, 16(2): 3435-3442. https://doi.org/10.1007/s12274-022-5007-x
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Abstract Full text Electronic supplementary material About this article

Recently, the discovery of a variety of moiré-related properties in the twisted vertical stacking of two different monolayers has attracted considerable attention. The introduction of small twist angles in transition metal dichalcogenide (TMD) heterostructures leads to the emergence of moiré potentials, which provide a fascinating platform for the study of strong interactions of electrons. While there has been extensive research on moiré excitons in twisted bilayer superlattices, the capture and study of moiré excitons in homostructure superlattices with layer-coupling effects remain elusive. Here, we present the observation of moiré excitons in the twisted 1L-WSe2/1L-WSe2 and 1L-WSe2/2L-WSe2 homostructures with various layer-coupling interactions. The results reveal that the moiré potential increases (~ 260%) as the number of underlying layers decreases, indicating the effect of layer coupling on the modulation of the moiré potential. The effects of the temperature and laser power dependence as well as valley polarization on moiré excitons were further demonstrated, and the crucial spectral features observed were explained. Our findings pave the way for exploring quantum phenomena and related applications of quantum information.


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Electronic supplementary material
About this article

Effect of layered-coupling in twisted WSe2 moiré superlattices

Show Author's information Biao Wu1,2, Haihong Zheng1,2, Shaofei Li1, Chang-Tian Wang3,4, Junnan Ding1, Jun He1, Zongwen Liu5,6, Jian-Tao Wang3,4,7( ), Yanping Liu1,2,8( )
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
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, 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
Songshan Lake Materials Laboratory, Dongguan 523808, China
Shenzhen Research Institute of Central South University, Shenzhen 518000, China

Abstract

Recently, the discovery of a variety of moiré-related properties in the twisted vertical stacking of two different monolayers has attracted considerable attention. The introduction of small twist angles in transition metal dichalcogenide (TMD) heterostructures leads to the emergence of moiré potentials, which provide a fascinating platform for the study of strong interactions of electrons. While there has been extensive research on moiré excitons in twisted bilayer superlattices, the capture and study of moiré excitons in homostructure superlattices with layer-coupling effects remain elusive. Here, we present the observation of moiré excitons in the twisted 1L-WSe2/1L-WSe2 and 1L-WSe2/2L-WSe2 homostructures with various layer-coupling interactions. The results reveal that the moiré potential increases (~ 260%) as the number of underlying layers decreases, indicating the effect of layer coupling on the modulation of the moiré potential. The effects of the temperature and laser power dependence as well as valley polarization on moiré excitons were further demonstrated, and the crucial spectral features observed were explained. Our findings pave the way for exploring quantum phenomena and related applications of quantum information.

Keywords: moiré superlattices, moiré potential, twisted homostructures, layer-coupling

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Publication history
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Acknowledgements

Publication history

Received: 25 July 2022
Revised: 27 August 2022
Accepted: 31 August 2022
Published: 07 October 2022
Issue date: February 2023

Copyright

© Tsinghua University Press 2022

Acknowledgements

The authors acknowledge support from the National Natural Science Foundation of China (No. 61775241), Hunan province key research and development project (No. 2019GK2233), Hunan Provincial Science Fund for Distinguished Young Scholars (No. 2020JJ2059), the Youth Innovation Team (No. 2019012) of CSU, the Science and Technology Innovation Basic Research Project of Shenzhen (No. JCYJ20190806144418859), the National Natural Science Foundation of China (Nos. 62090035 and U19A2090), and the Key Program of Science and Technology Department of Hunan Province (Nos. 2019XK2001 and 2020XK2001). The authors are also thankful for the support of the High-Performance Complex Manufacturing Key State Lab Project, Central South University (No. ZZYJKT2020-12). Z. W. L. thanks the support from the Australian Research Council (ARC Discovery Project, No. DP180102976). J.-T. W. acknowledge the support from the National Natural Science Foundation of China (No. 11974387), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB33000000), and the National Key Research and Development Program of China (No. 2020YFA0711502). The authors acknowledge the Beijing Super Cloud Computing Center (BSCC, www.blsc.cn) for providing HPC resources that have contributed to the research results reported within this paper. Also, we are grateful for resources from the High-Performance Computing Center of Central South University.

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