凝聚态物理
反铁磁性
材料科学
双层
金属-绝缘体过渡
绝缘体(电)
过渡金属
金属
物理
光电子学
化学
膜
生物化学
冶金
催化作用
作者
Xiaoyu Liu,Yuchi He,Chong Wang,Xiaowei Zhang,Ting Cao,Di Xiao
标识
DOI:10.1103/physrevlett.132.146401
摘要
A series of recent experimental works on twisted MoTe_{2} homobilayers have unveiled an abundance of exotic states in this system. Valley-polarized quantum anomalous Hall states have been identified at hole doping of ν=-1, and the fractional quantum anomalous Hall effect is observed at ν=-2/3 and ν=-3/5. In this Letter, we investigate the electronic properties of AA-stacked twisted bilayer MoTe_{2} at ν=-2 by k-space Hartree-Fock calculations. We identify a series of phases, among which a noteworthy phase is the antiferromagnetic Chern insulator, stabilized by an external electric field. We attribute the existence of this Chern insulator to an antiferromagnetic instability at a topological phase transition between the quantum spin hall phase and a band insulator phase. Our research proposes the potential of realizing a Chern insulator beyond ν=-1, and contributes fresh perspectives on the interplay between band topology and electron-electron correlations in moiré superlattices.
科研通智能强力驱动
Strongly Powered by AbleSci AI