Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices

Haihong Zheng; Biao Wu; Shaofei Li; Junnan Ding; Jun He; Zongwen Liu; Chang-Tian Wang; Jian-Tao Wang; Anlian Pan; Yanping Liu

doi:10.1038/s41377-023-01171-w

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Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices

Original Articles

- Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices
- Light: Science & Applications Vol. 12, Issue 6, Pages: 1020-1028(2023)
- Affiliations：
  
  1.School of Physics and Electronics, Hunan Key Laboratory for Supermicrostructure and Ultrafast Process, Central South University, 932 South Lushan Road, 410083 Changsha, Hunan, China
  2.State Key Laboratory of High-Performance Complex Manufacturing, Central South University, 932 South Lushan Road, 410083 Changsha, Hunan, China
  3.School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
  4.The University of Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
  5.Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, 100190 Beijing, China
  6.School of Physical Sciences, University of Chinese Academy of Sciences, 100049 Beijing, China
  7.Songshan Lake Materials Laboratory, 523808 Dongguan, Guangdong, China
  8.Hunan Institute of Optoelectronic Integration, College of Materials Science and Engineering, Hunan University, 410082 Changsha, Hunan, China
  9.Shenzhen Research Institute of Central South University, 518000 Shenzhen, China
- Author bio：
  
  Anlian Pan (anlian.pan@hnu.edu.cn)
  Yanping Liu (liuyanping@csu.edu.cn)
- Funds：
- DOI：10.1038/s41377-023-01171-w
  CLC：
- Published：30 June 2023，
  
  Published Online：12 May 2023，
  
  Received：6 September 2022，
  
  Revised：16 April 2023，
  
  Accepted：25 April 2023
Scan for full text
Zheng, H. H. et al. Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices. Light: Science & Applications, 12, 1020-1028 (2023).
DOI：

Zheng, H. H. et al. Localization-enhanced moiré exciton in twisted transition metal dichalcogenide heterotrilayer superlattices. Light: Science & Applications, 12, 1020-1028 (2023). DOI： 10.1038/s41377-023-01171-w.

摘要

Abstract

The stacking of twisted two-dimensional (2D) layered materials has led to the creation of moiré superlattices

which have become a new platform for the study of quantum optics. The strong coupling of moiré superlattices can result in flat minibands that boost electronic interactions and generate interesting strongly correlated states

including unconventional superconductivity

Mott insulating states

and moiré excitons. However

the impact of adjusting and localizing moiré excitons in Van der Waals heterostructures has yet to be explored experimentally. Here

we present experimental evidence of the localization-enhanced moiré excitons in the twisted WSe

/WS

/WSe

heterotrilayer with type-Ⅱ band alignments. At low temperatures

we observed multiple excitons splitting in the twisted WSe

/WS

/WSe

heterotrilayer

which is manifested as multiple sharp emission lines

in stark contrast to the moiré excitonic behavior of the twisted WSe

/WS

heterobilayer (which has a linewidth 4 times wider). This is due to the enhancement of the two moiré potentials in the twisted heterotrilayer

enabling highly localized moiré excitons at the interface. The confinement effect of moiré potential on moiré excitons is further demonstrated by changes in temperature

laser power

and valley polarization. Our findings offer a new approach for localizing moiré excitons in twist-angle heterostructures

which has the potential for the development of coherent quantum light emitters.

关键词

Keywords

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