Two-Dimensional Moiré Polaronic Electron Crystals

Arsenault, Eric A.; Li, Yiliu; Yang, Birui; Wang, Xi; Park, Heonjoon; Mosconi, Edoardo; Ronca, Enrico; Taniguchi, Takashi; Watanabe, Kenji; Gamelin, Daniel; Millis, Andrew; Dean, Cory R.; de Angelis, Filippo; Xu, Xiaodong; Zhu, X. Y.

doi:10.1103/physrevlett.132.126501

Title: Two-Dimensional Moiré Polaronic Electron Crystals (in EN)

Journal Article · 19 March 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.132.126501 · OSTI ID:2579676

^[1]; Li, Yiliu ^[1]; Yang, Birui ^[1]; Wang, Xi ^[2]; Park, Heonjoon ^[2]; Mosconi, Edoardo ^[3];

^[4]; Taniguchi, Takashi ^[5];

^[5];

^[2]; Millis, Andrew ^[1]; Dean, Cory R. ^[1]; de Angelis, Filippo ^[6]; Xu, Xiaodong ^[2];

^[1]

Columbia Univ., New York, NY (United States)
Univ. of Washington, Seattle, WA (United States)
Istituto CNR di Scienze e Tecnologie Chimiche (CNR-SCITEC), Perugia (Italy)
Univ. of Perugia (Italy)
National Institute for Materials Science (NIMS), Tsukuba (Japan)
Istituto CNR di Scienze e Tecnologie Chimiche (CNR-SCITEC), Perugia (Italy); Univ. of Perugia (Italy); Prince Mohammed Bin Fahd Univ., Al Khobar (Saudi Arabia); Sungkyunkwan Univ., Suwon (Republic of Korea)

Two-dimensional moiré materials have emerged as the most versatile platform for realizing quantum phases of electrons. Here, we explore the stability origins of correlated states in WSe₂/WS₂ moiré superlattices. We find that ultrafast electronic excitation leads to partial melting of the Mott states on timescales 5 times longer than predictions from the charge hopping integrals and that the melting rates are thermally activated, with activation energies of 1⁢8±3 and 1⁢3±2 meV for the one- and two-hole Mott states, respectively, suggesting significant electron-phonon coupling. A density functional theory calculation of the one-hole Mott state confirms polaron formation and yields a hole-polaron binding energy of 16 meV. These findings reveal a close interplay of electron-electron and electron-phonon interactions in stabilizing the polaronic Mott insulators at transition metal dichalcogenide moiré interfaces.

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Research Organization:: Columbia Univ., New York, NY (United States)

Sponsoring Organization:: H2020 European Research Council; Japan Society for the Promotion of Science; National Science Foundation; Simons Foundation; USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019443; SC0024343

OSTI ID:: 2579676

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 132; ISSN 1079-7114; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: EN

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Title: Two-Dimensional Moiré Polaronic Electron Crystals (in EN)

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