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arXiv · 2509.08254

Nonlinear opto-magnetic signature of d-wave altermagnets

Lijun Yang·Long Liang
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Abstract

Altermagnetism, a recently discovered collinear magnetic order with net zero magnetization but exhibiting spin-splitting band structure, has attracted much research interest due to the rich fundamental physics and possible applications. In this work, we investigate the opto-magnetic response of $d$-wave altermagnets, focusing on the inverse Cotton-Mouton effect--the induction of static magnetization via linearly polarized light. We find that the direction of the induced magnetization is determined by the N\'eel vector. Moreover, its magnitude exhibits a periodic dependence on the polarization angle of the incident light, a hallmark of the system's symmetry. Our findings demonstrate that the inverse Cotton-Mouton effect offers a direct method both for detecting $d$-wave altermagnets and for probing their intrinsic properties.

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Lijun Yang, Long Liang. 2025-09-10. Nonlinear opto-magnetic signature of d-wave altermagnets. https://doi.org/10.1103/gly7-jzfl

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