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Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi2Te4.

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Title: Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi2Te4.
Authors: Yujun Deng, Yijun Yu, Meng Zhu Shi, Zhongxun Guo, Zihan Xu, Jing Wang, Xian Hui Chen, Yuanbo Zhang
Source: Science (pre-March 2025). 2/21/2020, Vol. 367 Issue 6480, p895-900. 6p. 3 Diagrams, 1 Graph.
Subjects: Van der Waals clusters, Magnetic fluids, Septuplets, Symmetry, Ferromagnetic materials
Abstract: 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. [ABSTRACT FROM AUTHOR]
Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi<subscript>2</subscript>Te<subscript>4</subscript>.
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  Data: <searchLink fieldCode="AR" term="%22Yujun+Deng%22">Yujun Deng</searchLink><br /><searchLink fieldCode="AR" term="%22Yijun+Yu%22">Yijun Yu</searchLink><br /><searchLink fieldCode="AR" term="%22Meng+Zhu+Shi%22">Meng Zhu Shi</searchLink><br /><searchLink fieldCode="AR" term="%22Zhongxun+Guo%22">Zhongxun Guo</searchLink><br /><searchLink fieldCode="AR" term="%22Zihan+Xu%22">Zihan Xu</searchLink><br /><searchLink fieldCode="AR" term="%22Jing+Wang%22">Jing Wang</searchLink><br /><searchLink fieldCode="AR" term="%22Xian+Hui+Chen%22">Xian Hui Chen</searchLink><br /><searchLink fieldCode="AR" term="%22Yuanbo+Zhang%22">Yuanbo Zhang</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Science+%28pre-March+2025%29%22">Science (pre-March 2025)</searchLink>. 2/21/2020, Vol. 367 Issue 6480, p895-900. 6p. 3 Diagrams, 1 Graph.
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  Data: <searchLink fieldCode="DE" term="%22Van+der+Waals+clusters%22">Van der Waals clusters</searchLink><br /><searchLink fieldCode="DE" term="%22Magnetic+fluids%22">Magnetic fluids</searchLink><br /><searchLink fieldCode="DE" term="%22Septuplets%22">Septuplets</searchLink><br /><searchLink fieldCode="DE" term="%22Symmetry%22">Symmetry</searchLink><br /><searchLink fieldCode="DE" term="%22Ferromagnetic+materials%22">Ferromagnetic materials</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: 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. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Science (pre-March 2025) is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1126/science.aax8156
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      – Code: eng
        Text: English
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        PageCount: 6
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      – SubjectFull: Van der Waals clusters
        Type: general
      – SubjectFull: Magnetic fluids
        Type: general
      – SubjectFull: Septuplets
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      – SubjectFull: Symmetry
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      – SubjectFull: Ferromagnetic materials
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      – TitleFull: Quantum anomalous Hall effect in intrinsic magnetic topological insulator MnBi2Te4.
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            NameFull: Jing Wang
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              M: 02
              Text: 2/21/2020
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              Y: 2020
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