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Large Quantum Anomalous Hall Effect in Spin-Orbit Proximitized Rhombohedral Graphene

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arxiv 2310.17483 v3 pith:77VVISZ5 submitted 2023-10-26 cond-mat.mes-hall

Tonghang Han , Zhengguang Lu , Yuxuan Yao , Jixiang Yang , Junseok Seo , Chiho Yoon , Kenji Watanabe , Takashi Taniguchi
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Liang Fu Fan Zhang Long Ju
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classification cond-mat.mes-hall
keywords effectqahegraphenehallanomalouscorrelationelectronlarge
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The quantum anomalous Hall effect (QAHE) is a robust topological phenomenon featuring quantized Hall resistance at zero magnetic field. We report the QAHE in a rhombohedral pentalayer graphene/monolayer WS2 heterostructure. Distinct from other experimentally confirmed QAHE systems, this system has neither magnetic element nor moir\'e superlattice effect. The QAH states emerge at charge neutrality and feature Chern numbers C = +-5 at temperatures up to about 1.5 K. This large QAHE arises from the synergy of the electron correlation in intrinsic flat bands of pentalayer graphene, the gate-tuning effect, and the proximity-induced Ising spin-orbit-coupling. Our experiment demonstrates the potential of crystalline two-dimensional materials for intertwined electron correlation and band topology physics, and may enable a route for engineering chiral Majorana edge states.

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  1. Nanoscale infrared and microwave imaging of stacking faults in multilayer graphene

    cond-mat.mes-hall 2025-04 conditional novelty 6.0 of 10

    AFM-IR and sMIM can distinguish Bernal, rhombohedral, and intermediate stacking orders in multilayer graphene, including under a boron nitride coating.

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