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説明:

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.

権利情報:

• 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.

キーワード: moiré superlattices, Chern insulators, topological quantum-phase transition

刊行年月日: 2024-04-19

出版者: American Association for the Advancement of Science (AAAS)

掲載誌:

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

研究助成金:

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1126/science.adi4728

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更新時刻: 2025-07-22 12:30:31 +0900

MDRでの公開時刻: 2025-07-22 12:19:06 +0900