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Condensed Matter > Mesoscale and Nanoscale Physics
Title: Large Quantum Anomalous Hall Effect in Spin-Orbit Proximitized Rhombohedral Graphene
(Submitted on 26 Oct 2023 (v1), last revised 26 Apr 2024 (this version, v3))
Abstract: 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.
Submission history
From: Tonghang Han [view email][v1] Thu, 26 Oct 2023 15:41:59 GMT (738kb)
[v2] Thu, 28 Mar 2024 17:55:45 GMT (2059kb)
[v3] Fri, 26 Apr 2024 15:55:31 GMT (2014kb)
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