Strong Coupling of Chiral Magnons in Altermagnets.

Authors

Zhejunyu Jin, Tianci Gong, Jie Liu, Huanhuan Yang, Zhaozhuo Zeng, Yunshan Cao, Peng Yan

Published in

Physical review letters. Volume 135. Issue 12. Pages 126702. Sep 19, 2025.

Abstract

Altermagnets have recently been identified as a new class of magnets that break time-reversal symmetry without exhibiting net magnetization. The role of the dipole-dipole interaction (DDI) on their dynamical properties, however, is yet to be addressed. In this work, we show that the DDI can induce the strong coupling between exchange magnons with opposite chiralities in altermagnets, manifesting as a significant level repulsion in the magnon spectrum. Crucially, the predicted magnon-magnon coupling is highly anisotropic, and observable in practical experiments. These exotic features are absent in conventional antiferromagnets. Our findings open a new pathway for quantum magnonic information processing based on altermagnetism.

PMID:
41046398
Bibliographic data and abstract were imported from PubMed on 06 Oct 2025.

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