Quantum-metric-induced nonlinear transport in a topological antiferromagnet
The Berry curvature and quantum metric are the imaginary part and real part, respectively, of the quantum geometric tensor, which characterizes the topology of quantum states1. The Berry curvature is known to generate a number of important transport phenomena, such as the quantum Hall effect and the...
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sg-ntu-dr.10356-1713582023-10-23T02:08:01Z Quantum-metric-induced nonlinear transport in a topological antiferromagnet Wang, Naizhou Kaplan, Daniel Zhang, Zhaowei Holder, Tobias Cao, Ning Wang, Aifeng Zhou, Xiaoyuan Zhou, Feifei Jiang, Zhengzhi Zhang, Chusheng Ru, Shihao Cai, Hongbing Watanabe, Kenji Taniguchi, Takashi Yan, Binghai Gao, Weibo School of Physical and Mathematical Sciences Centre for Quantum Technologies, NUS The Photonics Institute Centre for Disruptive Photonic Technologies (CDPT) Science::Physics Ferromagnetic Material Density Functional Theory The Berry curvature and quantum metric are the imaginary part and real part, respectively, of the quantum geometric tensor, which characterizes the topology of quantum states1. The Berry curvature is known to generate a number of important transport phenomena, such as the quantum Hall effect and the anomalous Hall effect2,3; however, the consequences of the quantum metric have rarely been probed by transport measurements. Here we report the observation of quantum-metric-induced nonlinear transport, including both a nonlinear anomalous Hall effect and a diode-like non-reciprocal longitudinal response, in thin films of a topological antiferromagnet, MnBi2Te4. Our observations reveal that the transverse and longitudinal nonlinear conductivities reverse signs when reversing the antiferromagnetic order, diminish above the Néel temperature and are insensitive to disorder scattering, thus verifying their origin in the band-structure topology. They also flip signs between electron- and hole-doped regions, in agreement with theoretical calculations. Our work provides a means to probe the quantum metric through nonlinear transport and to design magnetic nonlinear devices. National Research Foundation (NRF) W.G. acknowledges the financial support from the Singapore National Research Foundation through its Competitive Research Program (CRP Award No. NRF-CRP22-2019-0004). B.Y. acknowledges the financial support by the European Research Council (ERC Consolidator Grant No. 815869, ‘NonlinearTopo’) and Israel Science Foundation (ISF No. 2932/21). A.W. acknowledges the financial support from the National Natural Science Foundation of China (grant no. 12004056), Chongqing Research Program of Basic Research and Frontier Technology, China (grant no. cstc2021jcyj-msxmX0661) and Fundamental Research Funds for the Central Universities, China (grant no. 2022CDJXY-002). X.Z. acknowledges the financial support from the National Key Research and Development Program of the Ministry of Science and Technology of China (2019YFA0704901) and the National Natural Science Foundation of China (grant nos. 52125103 and 52071041). 2023-10-23T01:15:26Z 2023-10-23T01:15:26Z 2023 Journal Article Wang, N., Kaplan, D., Zhang, Z., Holder, T., Cao, N., Wang, A., Zhou, X., Zhou, F., Jiang, Z., Zhang, C., Ru, S., Cai, H., Watanabe, K., Taniguchi, T., Yan, B. & Gao, W. (2023). Quantum-metric-induced nonlinear transport in a topological antiferromagnet. Nature, 621(7979), 487-492. https://dx.doi.org/10.1038/s41586-023-06363-3 0028-0836 https://hdl.handle.net/10356/171358 10.1038/s41586-023-06363-3 37385423 2-s2.0-85171267761 7979 621 487 492 en NRF-CRP22-2019-0004 Nature © 2023 The Author(s), under exclusive licence to Springer Nature Limited. All rights reserved. |
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Science::Physics Ferromagnetic Material Density Functional Theory Wang, Naizhou Kaplan, Daniel Zhang, Zhaowei Holder, Tobias Cao, Ning Wang, Aifeng Zhou, Xiaoyuan Zhou, Feifei Jiang, Zhengzhi Zhang, Chusheng Ru, Shihao Cai, Hongbing Watanabe, Kenji Taniguchi, Takashi Yan, Binghai Gao, Weibo Quantum-metric-induced nonlinear transport in a topological antiferromagnet |
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The Berry curvature and quantum metric are the imaginary part and real part, respectively, of the quantum geometric tensor, which characterizes the topology of quantum states1. The Berry curvature is known to generate a number of important transport phenomena, such as the quantum Hall effect and the anomalous Hall effect2,3; however, the consequences of the quantum metric have rarely been probed by transport measurements. Here we report the observation of quantum-metric-induced nonlinear transport, including both a nonlinear anomalous Hall effect and a diode-like non-reciprocal longitudinal response, in thin films of a topological antiferromagnet, MnBi2Te4. Our observations reveal that the transverse and longitudinal nonlinear conductivities reverse signs when reversing the antiferromagnetic order, diminish above the Néel temperature and are insensitive to disorder scattering, thus verifying their origin in the band-structure topology. They also flip signs between electron- and hole-doped regions, in agreement with theoretical calculations. Our work provides a means to probe the quantum metric through nonlinear transport and to design magnetic nonlinear devices. |
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School of Physical and Mathematical Sciences |
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School of Physical and Mathematical Sciences Wang, Naizhou Kaplan, Daniel Zhang, Zhaowei Holder, Tobias Cao, Ning Wang, Aifeng Zhou, Xiaoyuan Zhou, Feifei Jiang, Zhengzhi Zhang, Chusheng Ru, Shihao Cai, Hongbing Watanabe, Kenji Taniguchi, Takashi Yan, Binghai Gao, Weibo |
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Article |
author |
Wang, Naizhou Kaplan, Daniel Zhang, Zhaowei Holder, Tobias Cao, Ning Wang, Aifeng Zhou, Xiaoyuan Zhou, Feifei Jiang, Zhengzhi Zhang, Chusheng Ru, Shihao Cai, Hongbing Watanabe, Kenji Taniguchi, Takashi Yan, Binghai Gao, Weibo |
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Wang, Naizhou |
title |
Quantum-metric-induced nonlinear transport in a topological antiferromagnet |
title_short |
Quantum-metric-induced nonlinear transport in a topological antiferromagnet |
title_full |
Quantum-metric-induced nonlinear transport in a topological antiferromagnet |
title_fullStr |
Quantum-metric-induced nonlinear transport in a topological antiferromagnet |
title_full_unstemmed |
Quantum-metric-induced nonlinear transport in a topological antiferromagnet |
title_sort |
quantum-metric-induced nonlinear transport in a topological antiferromagnet |
publishDate |
2023 |
url |
https://hdl.handle.net/10356/171358 |
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1781793855348146176 |