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Strong Coupling of Chiral Magnons in Altermagnets
Zhejunyu Jin1, Tianci Gong1, Jie Liu1
1University of Electronic Science and Technology of China, School of Physics and State Key Laboratory of Electronic Thin Films and Integrated Devices, Chengdu 610054, China.
Physical Review Letters
|October 5, 2025
Summary
Altermagnets, a new class of magnets, exhibit unique dynamics due to dipole-dipole interactions. These interactions couple magnons, offering new possibilities for quantum information processing.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
- Spintronics
Background:
- Altermagnets are a novel class of magnetic materials breaking time-reversal symmetry without net magnetization.
- The influence of dipole-dipole interactions (DDI) on altermagnet dynamics remains largely unexplored.
Purpose of the Study:
- To investigate the role of DDI on the dynamical properties of altermagnets.
- To explore the potential of DDI-induced magnon coupling for quantum applications.
Main Methods:
- Theoretical analysis of magnon dynamics in altermagnets.
- Investigating the impact of dipole-dipole interactions on magnon spectra.
Main Results:
- DDI induces strong coupling between exchange magnons with opposite chiralities in altermagnets.
- This coupling results in significant level repulsion within the magnon spectrum.
- The predicted magnon-magnon coupling is highly anisotropic and experimentally observable.
Conclusions:
- DDI plays a crucial role in the unique dynamical properties of altermagnets.
- The findings reveal exotic features distinct from conventional antiferromagnets.
- This research paves the way for quantum magnonic information processing utilizing altermagnetism.
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