Strong Coupling of Chiral Magnons in Altermagnets

作者：Zhejunyu Jin, Tianci Gong, Jie Liu, Huanhuan Yang, Zhaozhuo Zeng, Yunshan Cao, Peng Yan · 发表于：Physical Review Letters · 年份：2025 · DOI：10.1103/gn6c-1q19 · 被引用次数：8 · 研究领域：Advanced Condensed Matter Physics、Topological Materials and Phenomena、Magnetic and transport properties of perovskites and related materials

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.