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Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene

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arxiv 1901.03520 v1 pith:62TEV2HS submitted 2019-01-11 cond-mat.mes-hall cond-mat.str-el

Aaron L. Sharpe , Eli J. Fox , Arthur W. Barnard , Joe Finney , Kenji Watanabe , Takashi Taniguchi , M. A. Kastner , David Goldhaber-Gordon This is my paper · ORCID
classification cond-mat.mes-hallcond-mat.str-el
keywords graphenebilayeremergentferromagneticfillinginteractionsnearsmall
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abstract

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. We observe emergent ferromagnetic hysteresis, with a giant anomalous Hall (AH) effect as large as $10.4\ \mathrm{k\Omega}$ and signs of chiral edge states in a narrow density range around an apparent insulating state at $3/4$. Surprisingly, the magnetization of the sample can be reversed by applying a small DC current. Although the AH resistance is not quantized and dissipation is significant, we suggest that the system is an incipient Chern insulator.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Mapping the twist angle and unconventional Landau levels in magic angle graphene

    cond-mat.mes-hall 2019-08 conditional novelty 8.0 of 10

    Local twist-angle maps in magic-angle twisted bilayer graphene reveal 0.1-degree variations and gradients that generate unscreened electric fields and bulk quantum Hall edge states.

  2. Attractive electron-electron interactions from internal screening in magic angle twisted bilayer graphene

    cond-mat.str-el 2019-09 conditional novelty 6.0 of 10

    Using RPA and cRPA, the authors find twist-angle-dependent screening in magic-angle twisted bilayer graphene, including real-space attractive regions in the RPA interaction and strongly reduced Hubbard parameters.

  3. SU(4) Heisenberg model on the honeycomb lattice with exchange-frustrated perturbations: implications for twistronics and Mott insulators

    cond-mat.str-el 2019-08 conditional novelty 5.5 of 10

    A combined spin-wave and variational Monte Carlo study finds that a quantum spin-orbital liquid survives a wide range of Hund's coupling and bond-dependent perturbations around the SU(4) symmetric point of the honeyco...

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