Article Mapping twist-tuned multiband topology in bilayer WSe 2

Benjamin A. Foutty ; Carlos R. Kometter ; Trithep Devakul ; Aidan P. Reddy ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials Science) ; Liang Fu ; Benjamin E. Feldman

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Benjamin A. Foutty, Carlos R. Kometter, Trithep Devakul, Aidan P. Reddy, Kenji Watanabe, Takashi Taniguchi, Liang Fu, Benjamin E. Feldman. Mapping twist-tuned multiband topology in bilayer WSe 2. Science. 2024, 384 (6693), 343-347. https://doi.org/10.1126/science.adi4728

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(abstract)

Semiconductor moiré superlattices have been shown to host a wide array of interaction-driven ground states. However, twisted homobilayers have been difficult to study in the limit of large moiré wavelengths, where interactions are most dominant. In this study, we conducted local electronic compressibility measurements of twisted bilayer WSe2 (tWSe2) at small twist angles. We demonstrated multiple topological bands that host a series of Chern insulators at zero magnetic field near a “magic angle” around 1.23°. Using a locally applied electric field, we induced a topological quantum-phase transition at one hole per moiré unit cell. Our work establishes the topological phase diagram of a generalized Kane-Mele-Hubbard model in tWSe2, demonstrating a tunable platform for strongly correlated topological phases.

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  • In Copyright

    This is the author’s version of the work. It is posted here by
    permission of the AAAS for personal use, not for redistribution. The definitive version was
    published in Science on Vol 384, 18 Apr 2024, DOI: 10.1126/science.adi4728.

Keyword: moiré superlattices, Chern insulators, topological quantum-phase transition

Date published: 2024-04-19

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

  • Science (ISSN: 10959203) vol. 384 issue. 6693 p. 343-347

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Manuscript type: Author's version (Accepted manuscript)

MDR DOI:

First published URL: https://doi.org/10.1126/science.adi4728

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Updated at: 2025-07-22 12:30:31 +0900

Published on MDR: 2025-07-22 12:19:06 +0900

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