Article Tuning moiré excitons and correlated electronic states through layer degree of freedom

Dongxue Chen ; Zhen Lian ; Xiong Huang ; Ying Su ; Mina Rashetnia ; Li Yan ; Mark Blei ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; Sefaattin Tongay ; Zenghui Wang ; Chuanwei Zhang ; Yong-Tao Cui ; Su-Fei Shi

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Dongxue Chen, Zhen Lian, Xiong Huang, Ying Su, Mina Rashetnia, Li Yan, Mark Blei, Takashi Taniguchi, Kenji Watanabe, Sefaattin Tongay, Zenghui Wang, Chuanwei Zhang, Yong-Tao Cui, Su-Fei Shi. Tuning moiré excitons and correlated electronic states through layer degree of freedom. Nature Communications. 2022, 13 (1), 4810. https://doi.org/10.1038/s41467-022-32493-9
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(abstract)

Moiré coupling in transition metal dichalcogenides (TMDCs) superlattices introduces flat minibands that enable strong electronic correlation and fascinating correlated states, and it also modifies the strong Coulomb interaction driven excitons and gives rise to moiré excitons. Here, we introduce the layer degree of freedom to the WSe2/WS2 moiré superlattice by changing WSe2 from monolayer to bilayer and trilayer. We observe systematic changes of optical spectra of the moiré excitons, which directly confirm the highly interfacial nature of moiré coupling at the WSe2/WS2 interface. In addition, the energy resonances of moiré excitons are modified, and their separations are significantly increased in multilayer WSe2/ monolayer WS2 moiré superlattice, revealing intriguing hybridization between moiré excitons in the WSe2 layer interfacing WS2 and intralayer excitons in the added WSe2 layer(s). The additional WSe2 layers also reduce the electronic correlation strength, evidenced by the reduced Mott transition temperature and disappearance of correlated insulating states at fractional fillings. The modulation of both moiré excitons and correlated electronic states at the increased number of WSe2 layers can be well described by our theoretical model. Our study presents a new method to tune the strong electronic correlation and moiré exciton bands in the TMDCs moiré superlattices, ushering in an exciting platform to engineer quantum phenomena stemming from strong correlation and Coulomb interaction.

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Keyword: Moiré coupling, transition metal dichalcogenides, excitons

Date published: 2022-08-16

Publisher: Springer Science and Business Media LLC

Journal:

  • Nature Communications (ISSN: 20411723) vol. 13 issue. 1 4810

Funding:

  • United States Department of Defense | United States Air Force | AFMC | Air Force Office of Scientific Research FA9550-20-1-0179
  • National Science Foundation DMR-1945420
  • National Science Foundation DMR-2104902

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1038/s41467-022-32493-9

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Updated at: 2025-02-27 08:30:33 +0900

Published on MDR: 2025-02-27 08:30:33 +0900

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