Strong interactions and isospin symmetry breaking in a supermoiré lattice

• 成果类型: Article
• 署名作者: Xie, Yonglong; Pierce, Andrew T.; Park, Jeong Min; Parker, Daniel E.; Wang, Jie; Ledwith, Patrick; Cai, Zhuozhen; Watanabe, Kenji; Taniguchi, Takashi; Khalaf, Eslam; Vishwanath, Ashvin; Jarillo-Herrero, Pablo; Yacoby, Amir
• 署名单位: Harvard University; Massachusetts Institute of Technology (MIT); Rice University; Rice University; Harvard University; National Institute for Materials Science; National Institute for Materials Science
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-12970
• DOI: 10.1126/science.adl2544
• 发表日期: 2025-08-14
• 页码: 736-740
• 关键词: graphene; superconductivity; moire

摘要

In multilayer moir & eacute; heterostructures, the interference of multiple twist angles ubiquitously leads to tunable ultralong-wavelength patterns known as supermoir & eacute; lattices. However, their impact on the system's many-body electronic phase diagram remains largely unexplored. We present local compressibility measurements revealing numerous incompressible states resulting from supermoir & eacute; lattice-scale isospin symmetry breaking driven by strong interactions. By using the supermoir & eacute; lattice occupancy as a probe of isospin symmetry, we observed an unexpected doubling of the miniband filling near nu=-2, possibly indicating a hidden phase transition or normal-state pairing proximal to the superconducting phase. Our work establishes supermoir & eacute; lattices as a tunable parameter for designing quantum phases and as an effective tool for unraveling correlated phenomena in moir & eacute; materials.