Observation of a magneto-nonlinear Hall effect in an altermagnet candidate

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ID: 338352
2026
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Abstract
Abstract Nonlinear Hall effects have emerged as defining probes of quantum geometry. Here we observe a Hall response that is nonlinear in the magnetic field rather than the electric field, in Mn5Si3 thin films, an altermagnet candidate, in the canonical Hall geometry: a high-field Hall conductivity component that grows quadratically with an out-of-plane field. Opposite-sign Berry curvatures associated with opposite-spin bands nearly cancel at low fields, but Zeeman band shifts at high fields lift this cancellation and generate increasing net total Berry curvature. This magnetic-field-tuned Berry-curvature imbalance can generally produce a nonlinear Hall conductivity, and the observed quadratic dependence in Mn5Si3 is consistent with chiral next-nearest-neighbor hopping involving magnetic exchange and Haldane-like flux phases. Moreover, reversal of magnetic order under opposite fields reverses the hopping chirality, making this quadratic contribution odd in field. Beyond fundamental advances, the nonlinear response remains unsaturated up to 57 T, suggesting possible opportunities for high-field Hall sensing.
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Authors Lei Han, Xizhi Fu, Xiaokang Li, Feng Zhou, Xiaodong Guo, Shixuan Liang, Yuxiang Zhu, Hua Bai, Ruiyue Chu, Jiankun Dai, Chao Dong, Yong‐Chang Lau, Wenhong Wang, Na Chen, Zengwei Zhu, Maciek Sawicki, Junwei Liu, Feng Pan, Cheng Song
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Journal national science review
Year 2026
DOI
10.1093/nsr/nwag693
URL
https://doi.org/10.1093/nsr/nwag693
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