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, Kenji Watanabe, Sefaattin Tongay, Zenghui Wang (), Chuanwei Zhang (), Yong-Tao Cui () and Su-Fei Shi ()
Additional contact information
Dongxue Chen: University of Electronic Science and Technology of China
Zhen Lian: Rensselaer Polytechnic Institute
Xiong Huang: University of California
Ying Su: University of Texas at Dallas
Mina Rashetnia: University of California
Li Yan: Rensselaer Polytechnic Institute
Mark Blei: Arizona State University
Takashi Taniguchi: International Center for Materials Nanoarchitectonics, National Institute for Materials Science
Kenji Watanabe: Research Center for Functional Materials, National Institute for Materials Science
Sefaattin Tongay: Arizona State University
Zenghui Wang: University of Electronic Science and Technology of China
Chuanwei Zhang: University of Texas at Dallas
Yong-Tao Cui: University of California
Su-Fei Shi: Rensselaer Polytechnic Institute

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: 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 strongly modified, with their separation significantly increased in multilayer WSe2/monolayer WS2 moiré superlattice. The additional WSe2 layers also modulate the strong electronic correlation strength, evidenced by the reduced Mott transition temperature with added WSe2 layer(s). The layer dependence of both moiré excitons and correlated electronic states 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.

Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.nature.com/articles/s41467-022-32493-9 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-32493-9

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-022-32493-9

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().