Spin-orbit–driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene

Lin, Jiang-Xiazi; Zhang, Ya-Hui; Morissette, Erin; Wang, Zhi; Liu, Song; Rhodes, Daniel; Watanabe, K.; Taniguchi, T.; Hone, James; Li, J. I. A.

doi:10.1126/science.abh2889

Title: Spin-orbit–driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene

Journal Article · Thu Jan 06 00:00:00 EST 2022 · Science

DOI:https://doi.org/10.1126/science.abh2889· OSTI ID:1982952

^[1]; Zhang, Ya-Hui ^[2]; Morissette, Erin ^[1];

^[1];

^[3]; Rhodes, Daniel ^[3];

^[4];

^[3];

^[1]

Brown University, Providence, RI (United States)
Harvard University, Cambridge, MA (United States)
Columbia University, New York, NY (United States)
National Institute for Materials Science (NIMS), Tsukuba (Japan)

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 moiré 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 moiré bands in twisted bilayer graphene and related systems.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies (CINT)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Science Foundation (NSF); Medical Research Institute Sri Lanka (MRI)

Grant/Contract Number:: 89233218CNA000001; DMR-1827453; DMR-2011738

OSTI ID:: 1982952

Journal Information:: Science, Vol. 375, Issue 6579; ISSN 0036-8075

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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