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

Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene

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

Reviewed by Pithpith:62TEV2HSopen to challenge →

classification cond-mat.mes-hall cond-mat.str-el
keywords graphenebilayeremergentferromagneticfillinginteractionsnearsmall
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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. 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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