Quadrupolar excitons and hybridized interlayer Mott insulator in a trilayer moiré superlattice

Lian, Zhen; Chen, Dongxue; Ma, Lei; Meng, Yuze; Su, Ying; Yan, Li; Huang, Xiong; Wu, Qiran; Chen, Xinyue; Blei, Mark; Taniguchi, Takashi; Watanabe, Kenji; Tongay, Sefaattin; Zhang, Chuanwei; Cui, Yong-Tao; Shi, Su-Fei

doi:10.1038/s41467-023-40288-9

Quadrupolar excitons and hybridized interlayer Mott insulator in a trilayer moiré superlattice

Journal Article · Tue Aug 01 00:00:00 EDT 2023 · Nature Communications

DOI:https://doi.org/10.1038/s41467-023-40288-9· OSTI ID:2421625

Lian, Zhen ^[1]; ^[2]; ^[2]; Meng, Yuze ^[2]; Su, Ying ^[3]; Yan, Li ^[2]; ^[4]; Wu, Qiran ^[4]; Chen, Xinyue ^[2]; Blei, Mark ^[5]; ^[6]; ^[6]; ^[5]; ^[3]; ^[4]; ^[2]

Rensselaer Polytechnic Inst., Troy, NY (United States); Rensselaer Polytechnic Institute, Troy, NY (United States)
Rensselaer Polytechnic Inst., Troy, NY (United States)
Univ. of Texas at Dallas, TX (United States)
Univ. of California, Riverside, CA (United States)
Arizona State Univ., Tempe, AZ (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)

Transition metal dichalcogenide (TMDC) moiré superlattices, owing to the moiré flatbands and strong correlation, can host periodic electron crystals and fascinating correlated physics. The TMDC heterojunctions in the type-II alignment also enable long-lived interlayer excitons that are promising for correlated bosonic states, while the interaction is dictated by the asymmetry of the heterojunction. Here we demonstrate a new excitonic state, quadrupolar exciton, in a symmetric WSe₂-WS₂-WSe₂ trilayer moiré superlattice. The quadrupolar excitons exhibit a quadratic dependence on the electric field, distinctively different from the linear Stark shift of the dipolar excitons in heterobilayers. This quadrupolar exciton stems from the hybridization of WSe₂ valence moiré flatbands. The same mechanism also gives rise to an interlayer Mott insulator state, in which the two WSe₂ layers share one hole laterally confined in one moiré unit cell. In contrast, the hole occupation probability in each layer can be continuously tuned via an out-of-plane electric field, reaching 100% in the top or bottom WSe₂ under a large electric field, accompanying the transition from quadrupolar excitons to dipolar excitons. Our work demonstrates a trilayer moiré system as a new exciting playground for realizing novel correlated states and engineering quantum phase transitions.

View Accepted Manuscript (DOE)

Research Organization:: Arizona State Univ., Tempe, AZ (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0020653

OSTI ID:: 2421625

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 14; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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