Nonlinear Optomagnetic Signature of d-Wave Altermagnets.

Authors

Lijun Yang, Long Liang

Published in

Physical review letters. Volume 136. Issue 22. Pages 226702. Jun 05, 2026.

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 Letter, we investigate the optomagnetic 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 Néel 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.

PMID:
42330444
Bibliographic data and abstract were imported from PubMed on 23 Jun 2026.

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