Large quantum anomalous Hall effect in spin-orbit proximitized rhombohedral graphene

• 成果类型: Article
• 署名作者: Han, Tonghang; Lu, Zhengguang; Yao, Yuxuan; Yang, Jixiang; Seo, Junseok; Yoon, Chiho; Watanabe, Kenji; Taniguchi, Takashi; Fu, Liang; Zhang, Fan; Ju, Long
• 署名单位: Massachusetts Institute of Technology (MIT); University of Texas System; University of Texas Dallas; National Institute for Materials Science; National Institute for Materials Science
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8355
• DOI: 10.1126/science.adk9749
• 发表日期: 2024-05-10
• 页码: 647-651
• 关键词: transport; insulator; superconductivity; ferromagnetism; spectroscopy; realization; driven; MODEL

摘要

The quantum anomalous Hall effect (QAHE) is a robust topological phenomenon that features quantized Hall resistance at zero magnetic field. We report the QAHE in a rhombohedral pentalayer graphene-monolayer tungsten disulfide (WS2) heterostructure. Distinct from other experimentally confirmed QAHE systems, this system has neither magnetic element nor moir & eacute; superlattice effect. The QAH states emerge at charge neutrality and feature Chern numbers C = +/- 5 at temperatures of up to about 1.5 kelvin. 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.