Programming correlated magnetic states with gate-controlled moire geometry
成果类型：
Article
署名作者：
Anderson, Eric; Fan, Feng-Ren; Cai, Jiaqi; Holtzmann, William; Taniguchi, Takashi; Watanabe, Kenji; Xiao, Di; Yao, Wang; Xu, Xiaodong
署名单位：
University of Washington; University of Washington Seattle; University of Hong Kong; National Institute for Materials Science; National Institute for Materials Science; University of Washington; University of Washington Seattle
刊物名称：
SCIENCE
ISSN/ISSBN：
0036-8829
DOI：
10.1126/science.adg4268
发表日期：
2023-07-21
页码：
325-330
关键词：
摘要：
The ability to control the underlying lattice geometry of a system may enable transitions between emergent quantum ground states. We report in situ gate switching between honeycomb and triangular lattice geometries of an electron many-body Hamiltonian in rhombohedral (R)-stacked molybdenum ditelluride (MoTe2) moire bilayers, resulting in switchable magnetic exchange interactions. At zero electric field, we observed a correlated ferromagnetic insulator near one hole per moire unit cell with a widely tunable Curie temperature up to 14 K. Applying an electric field switched the system into a half-filled triangular lattice with antiferromagnetic interactions; further doping this layer-polarized superlattice tuned the antiferromagnetic exchange interaction back to ferromagnetic. Our work demonstrates R-stacked MoTe2 moires to be a laboratory for engineering correlated states with nontrivial topology.