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Correlation-driven nonequilibrium exciton site transition in a WSe2/WS2 moiré supercell

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Title
Correlation-driven nonequilibrium exciton site transition in a WSe2/WS2 moiré supercell
Author(s)
Kim, Jinjae; Park, Jiwon; Choi, Hyojin; Taeho Kim; Cha, Soonyoung; Yewon Lee; Watanabe, Kenji; Taniguchi, Takashi; Jonghwan Kim; Moon-Ho Jo; Choi, Hyunyong
Publication Date
2024-04
Journal
Nature Communications, v.15, no.1
Publisher
Nature Publishing Group
Abstract
Moiré superlattices of transition metal dichalcogenides offer a unique platform to explore correlated exciton physics with optical spectroscopy. Whereas the spatially modulated potentials evoke that the exciton resonances are distinct depending on a site in a moiré supercell, there have been no clear demonstration how the moiré excitons trapped in different sites dynamically interact with the doped carriers; so far the exciton-electron dynamic interactions were presumed to be site-dependent. Thus, the transient emergence of nonequilibrium correlations are open questions, but existing studies are limited to steady-state optical measurements. Here we report experimental fingerprints of site-dependent exciton correlations under continuous-wave as well as ultrashort optical excitations. In near-zero angle-aligned WSe2/WS2 heterobilayers, we observe intriguing polarization switching and strongly enhanced Pauli blocking near the Mott insulating state, dictating the dominant correlation-driven effects. When the twist angle is near 60°, no such correlations are observed, suggesting the strong dependence of atomic registry in moiré supercell configuration. Our studies open the door to largely unexplored nonequilibrium correlations of excitons in moiré superlattices. © The Author(s) 2024.
URI
https://pr.ibs.re.kr/handle/8788114/15182
DOI
10.1038/s41467-024-47768-6
Appears in Collections:
Center for Van der Waals Quantum Solids(반데르발스 양자 물질 연구단) > 1. Journal Papers (저널논문)
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