气候变化领域集成服务门户(CCPortal): Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi2Te4

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DOI	10.1126/science.aax8156
	Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi2Te4
	Deng Y.; Yu Y.; Shi M.Z.; Guo Z.; Xu Z.; Wang J.; Chen X.H.; Zhang Y.
发表日期	2020
ISSN	0036-8075
起始页码	895
结束页码	900
卷号	367 期号:6480
英文摘要	In a magnetic topological insulator, nontrivial band topology combines with magnetic order to produce exotic states of matter, such as quantum anomalous Hall (QAH) insulators and axion insulators. In this work, we probe quantum transport in MnBi2Te4 thin flakes-a topological insulator with intrinsic magnetic order. In this layered van der Waals crystal, the ferromagnetic layers couple antiparallel to each other; atomically thin MnBi2Te4, however, becomes ferromagnetic when the sample has an odd number of septuple layers. We observe a zero-field QAH effect in a five-septuple-layer specimen at 1.4 kelvin, and an external magnetic field further raises the quantization temperature to 6.5 kelvin by aligning all layers ferromagnetically. The results establish MnBi2Te4 as an ideal arena for further exploring various topological phenomena with a spontaneously broken time-reversal symmetry. © 2020 American Association for the Advancement of Science. All rights reserved.
关键词	insulation magnetic field quantum mechanics sampling symmetry temperature topology article crystal magnetic field
语种	英语
来源机构	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133703
推荐引用方式 GB/T 7714	Deng Y.,Yu Y.,Shi M.Z.,et al. Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi2Te4[J]. Science,2020,367(6480).
APA	Deng Y..,Yu Y..,Shi M.Z..,Guo Z..,Xu Z..,...&Zhang Y..(2020).Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi2Te4.,367(6480).
MLA	Deng Y.,et al."Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi2Te4".367.6480(2020).