扭转
拓扑(电路)
双层
物理
结晶学
材料科学
数学
几何学
化学
组合数学
膜
生物化学
作者
Benjamin A. Foutty,Carlos R. Kometter,Trithep Devakul,Aidan P. Reddy,Kenji Watanabe,Takashi Taniguchi,Liang Fu,Benjamin E. Feldman
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2024-04-19
卷期号:384 (6693): 343-347
标识
DOI:10.1126/science.adi4728
摘要
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 WSe 2 (tWSe 2 ) 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 tWSe 2 , demonstrating a tunable platform for strongly correlated topological phases.
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