Mapping twist-tuned multiband topology in bilayer WSe2

• 成果类型: Article
• 署名作者: Foutty, Benjamin A.; Kometter, Carlos R.; Devakul, Trithep; Reddy, Aidan P.; Watanabe, Kenji; Taniguchi, Takashi; Fu, Liang; Feldman, Benjamin E.
• 署名单位: Stanford University; Massachusetts Institute of Technology (MIT); National Institute for Materials Science; National Institute for Materials Science; Stanford University; United States Department of Energy (DOE); SLAC National Accelerator Laboratory
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8983
• DOI: 10.1126/science.adi4728
• 发表日期: 2024-04-19
• 页码: 343-347
• 关键词: magic-angle; 2-dimensional electron; landau-levels; compressibility; TRANSITION; insulator; physics; STATES; mott

摘要

Semiconductor moire 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 moire wavelengths, where interactions are most dominant. In this study, we conducted local electronic compressibility measurements of twisted bilayer WSe2 (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(degrees). Using a locally applied electric field, we induced a topological quantum-phase transition at one hole per moire 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.