Layer Hall effect in a 2D topological axion antiferromagnet
Whereas ferromagnets have been known and used for millennia, antiferromagnets were only discovered in the 1930s1. At large scale, because of the absence of global magnetization, antiferromagnets may seem to behave like any non-magnetic material. At the microscopic level, however, the opposite alignm...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/156342 |
| _version_ | 1811690813871095808 |
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| author | Gao, Anyuan Liu, Yu-Fei Hu, Chaowei Qiu, Jian-Xiang Tzschaschel, Christian Ghosh, Barun Ho, Sheng-Chin Bérubé, Damien Chen, Rui Sun, Haipeng Zhang, Zhaowei Zhang, Xin-Yue Wang, Yu-Xuan Wang, Naizhou Huang, Zumeng Felser, Claudia Agarwal, Amit Ding, Thomas Tien, Hung-Ju Akey, Austin Gardener, Jules Singh, Bahadur Watanabe, Kenji Taniguchi, Takashi Burch, Kenneth S. Bell, David C. Zhou, Brian B. Gao, Weibo Lu, Hai-Zhou Bansil, Arun Lin, Hsin Chang, Tay-Rong Fu, Liang Ma, Qiong Ni, Ni Xu, Su-Yang |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Gao, Anyuan Liu, Yu-Fei Hu, Chaowei Qiu, Jian-Xiang Tzschaschel, Christian Ghosh, Barun Ho, Sheng-Chin Bérubé, Damien Chen, Rui Sun, Haipeng Zhang, Zhaowei Zhang, Xin-Yue Wang, Yu-Xuan Wang, Naizhou Huang, Zumeng Felser, Claudia Agarwal, Amit Ding, Thomas Tien, Hung-Ju Akey, Austin Gardener, Jules Singh, Bahadur Watanabe, Kenji Taniguchi, Takashi Burch, Kenneth S. Bell, David C. Zhou, Brian B. Gao, Weibo Lu, Hai-Zhou Bansil, Arun Lin, Hsin Chang, Tay-Rong Fu, Liang Ma, Qiong Ni, Ni Xu, Su-Yang |
| author_sort | Gao, Anyuan |
| collection | NTU |
| description | Whereas ferromagnets have been known and used for millennia, antiferromagnets were only discovered in the 1930s1. At large scale, because of the absence of global magnetization, antiferromagnets may seem to behave like any non-magnetic material. At the microscopic level, however, the opposite alignment of spins forms a rich internal structure. In topological antiferromagnets, this internal structure leads to the possibility that the property known as the Berry phase can acquire distinct spatial textures2,3. Here we study this possibility in an antiferromagnetic axion insulator-even-layered, two-dimensional MnBi2Te4-in which spatial degrees of freedom correspond to different layers. We observe a type of Hall effect-the layer Hall effect-in which electrons from the top and bottom layers spontaneously deflect in opposite directions. Specifically, under zero electric field, even-layered MnBi2Te4 shows no anomalous Hall effect. However, applying an electric field leads to the emergence of a large, layer-polarized anomalous Hall effect of about 0.5e2/h (where e is the electron charge and h is Planck's constant). This layer Hall effect uncovers an unusual layer-locked Berry curvature, which serves to characterize the axion insulator state. Moreover, we find that the layer-locked Berry curvature can be manipulated by the axion field formed from the dot product of the electric and magnetic field vectors. Our results offer new pathways to detect and manipulate the internal spatial structure of fully compensated topological antiferromagnets4-9. The layer-locked Berry curvature represents a first step towards spatial engineering of the Berry phase through effects such as layer-specific moiré potential. |
| first_indexed | 2024-10-01T06:09:58Z |
| format | Journal Article |
| id | ntu-10356/156342 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:09:58Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1563422023-02-28T20:05:48Z Layer Hall effect in a 2D topological axion antiferromagnet Gao, Anyuan Liu, Yu-Fei Hu, Chaowei Qiu, Jian-Xiang Tzschaschel, Christian Ghosh, Barun Ho, Sheng-Chin Bérubé, Damien Chen, Rui Sun, Haipeng Zhang, Zhaowei Zhang, Xin-Yue Wang, Yu-Xuan Wang, Naizhou Huang, Zumeng Felser, Claudia Agarwal, Amit Ding, Thomas Tien, Hung-Ju Akey, Austin Gardener, Jules Singh, Bahadur Watanabe, Kenji Taniguchi, Takashi Burch, Kenneth S. Bell, David C. Zhou, Brian B. Gao, Weibo Lu, Hai-Zhou Bansil, Arun Lin, Hsin Chang, Tay-Rong Fu, Liang Ma, Qiong Ni, Ni Xu, Su-Yang School of Physical and Mathematical Sciences Science::Physics Topology Electric Field Whereas ferromagnets have been known and used for millennia, antiferromagnets were only discovered in the 1930s1. At large scale, because of the absence of global magnetization, antiferromagnets may seem to behave like any non-magnetic material. At the microscopic level, however, the opposite alignment of spins forms a rich internal structure. In topological antiferromagnets, this internal structure leads to the possibility that the property known as the Berry phase can acquire distinct spatial textures2,3. Here we study this possibility in an antiferromagnetic axion insulator-even-layered, two-dimensional MnBi2Te4-in which spatial degrees of freedom correspond to different layers. We observe a type of Hall effect-the layer Hall effect-in which electrons from the top and bottom layers spontaneously deflect in opposite directions. Specifically, under zero electric field, even-layered MnBi2Te4 shows no anomalous Hall effect. However, applying an electric field leads to the emergence of a large, layer-polarized anomalous Hall effect of about 0.5e2/h (where e is the electron charge and h is Planck's constant). This layer Hall effect uncovers an unusual layer-locked Berry curvature, which serves to characterize the axion insulator state. Moreover, we find that the layer-locked Berry curvature can be manipulated by the axion field formed from the dot product of the electric and magnetic field vectors. Our results offer new pathways to detect and manipulate the internal spatial structure of fully compensated topological antiferromagnets4-9. The layer-locked Berry curvature represents a first step towards spatial engineering of the Berry phase through effects such as layer-specific moiré potential. National Research Foundation (NRF) Submitted/Accepted version Z.Z., N.W., Z.H. and W.G. thank the Singapore National Research Foundation through its Competitive Research Program (CRP award no. NRF-CRP21-2018-0007, NRF-CRP22-2019-0004). 2022-04-17T08:51:25Z 2022-04-17T08:51:25Z 2021 Journal Article Gao, A., Liu, Y., Hu, C., Qiu, J., Tzschaschel, C., Ghosh, B., Ho, S., Bérubé, D., Chen, R., Sun, H., Zhang, Z., Zhang, X., Wang, Y., Wang, N., Huang, Z., Felser, C., Agarwal, A., Ding, T., Tien, H., ...Xu, S. (2021). Layer Hall effect in a 2D topological axion antiferromagnet. Nature, 595, 521-525. https://dx.doi.org/10.1038/s41586-021-03679-w 0028-0836 https://hdl.handle.net/10356/156342 10.1038/s41586-021-03679-w 34290425 2-s2.0-85110967125 595 521 525 en NRF-CRP21-2018-0007 NRF-CRP22-2019-0004 Nature © 2021 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved. This paper was published in Nature and is made available with permission of The Author(s). application/pdf |
| spellingShingle | Science::Physics Topology Electric Field Gao, Anyuan Liu, Yu-Fei Hu, Chaowei Qiu, Jian-Xiang Tzschaschel, Christian Ghosh, Barun Ho, Sheng-Chin Bérubé, Damien Chen, Rui Sun, Haipeng Zhang, Zhaowei Zhang, Xin-Yue Wang, Yu-Xuan Wang, Naizhou Huang, Zumeng Felser, Claudia Agarwal, Amit Ding, Thomas Tien, Hung-Ju Akey, Austin Gardener, Jules Singh, Bahadur Watanabe, Kenji Taniguchi, Takashi Burch, Kenneth S. Bell, David C. Zhou, Brian B. Gao, Weibo Lu, Hai-Zhou Bansil, Arun Lin, Hsin Chang, Tay-Rong Fu, Liang Ma, Qiong Ni, Ni Xu, Su-Yang Layer Hall effect in a 2D topological axion antiferromagnet |
| title | Layer Hall effect in a 2D topological axion antiferromagnet |
| title_full | Layer Hall effect in a 2D topological axion antiferromagnet |
| title_fullStr | Layer Hall effect in a 2D topological axion antiferromagnet |
| title_full_unstemmed | Layer Hall effect in a 2D topological axion antiferromagnet |
| title_short | Layer Hall effect in a 2D topological axion antiferromagnet |
| title_sort | layer hall effect in a 2d topological axion antiferromagnet |
| topic | Science::Physics Topology Electric Field |
| url | https://hdl.handle.net/10356/156342 |
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