期刊
SCIENCE
卷 367, 期 6480, 页码 895-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax8156
关键词
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资金
- National Key Research Program of China [2016YFA0300703, 2018YFA0305600]
- NSF of China [U1732274, 11527805, 11425415, 11421404, 11774065]
- Shanghai Municipal Science and Technology Commission [18JC1410300]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB30000000, XDB25000000]
- China Postdoctoral Science Foundation [BX20180076, 2018M641907]
- NSF of Shanghai [17ZR1442500]
- National Natural Science Foundation of China [11888101, 11534010]
- National Key R&D Program of China [2017YFA0303001, 2016YFA0300201]
- Key Research Program of Frontier Sciences of the Chinese Academy of Sciences [QYZDY-SSW-SLH021]
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.
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