Journal
SCIENCE
Volume 365, Issue 6453, Pages 605-608Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaw3780
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division [DE-AC02-76SF00515]
- Gordon and Betty Moore Foundation [GBMF3429]
- National Science Foundation [ECCS-1542152]
- Ford Foundation Predoctoral Fellowship
- National Science Foundation Graduate Research Fellowship
- ARCS Foundation Fellowship
- Elemental Strategy Initiative
- CREST, JST [JPMJCR15F3]
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When two sheets of graphene are stacked at a small twist angle, the resulting flat superlattice minibands are expected to strongly enhance electron-electron interactions. Here, we present evidence that near three-quarters (3/4) filling of the conduction miniband, these enhanced interactions drive the twisted bilayer graphene into a ferromagnetic state. In a narrow density range around an apparent insulating state at 3/4, we observe emergent ferromagnetic hysteresis, with a giant anomalous Hall (AH) effect as large as 10.4 kilohms and indications of chiral edge states. Notably, the magnetization of the sample can be reversed by applying a small direct current. Although the AH resistance is not quantized, and dissipation is present, our measurements suggest that the system may be an incipient Chern insulator.
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