• 文献标题:   Spin-orbit-driven ferromagnetism at half moire filling in magic-angle twisted bilayer graphene
  • 文献类型:   Article
  • 作  者:   LIN JX, ZHANG YH, MORISSETTE E, WANG Z, LIU S, RHODES D, WATANABE K, TANIGUCHI T, HONE J, LI JIA
  • 作者关键词:  
  • 出版物名称:   SCIENCE
  • ISSN:   0036-8075 EI 1095-9203
  • 通讯作者地址:  
  • 被引频次:   28
  • DOI:   10.1126/science.abh2889
  • 出版年:   2022

▎ 摘  要

Strong electron correlation and spin-orbit coupling (SOC) can have a profound influence on the electronic properties of materials. We examined their combined influence on a two-dimensional electronic system at the atomic interface between magic-angle twisted bilayer graphene and a tungsten diselenide crystal. We found that strong electron correlation within the moire flatband stabilizes correlated insulating states at both quarter and half filling, and that SOC transforms these Mott-like insulators into ferromagnets, as evidenced by a robust anomalous Hall effect with hysteretic switching behavior. The coupling between spin and valley degrees of freedom could be demonstrated through control of the magnetic order with an in-plane magnetic field or a perpendicular electric field. Our findings establish an experimental knob to engineer topological properties of moire bands in twisted bilayer graphene and related systems.