Eigenstates and temporal dynamics in cavity optomagnonics
Yun-Jing Ding(丁云静)1 and Yang Xiao(肖杨)2,†
1 School of Physics, Nanjing University, Nanjing 210093, China; 2 Department of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
Abstract Many studies of magnon-photon coupling are performed in the frequency domain for microwave photons. In this work, we present analytical results of eigenfrequency, eigenstates, and temporal dynamics for the coupling between ferromagnetic magnon and visible photon. In contrast to microwave photons, optical photons can be coupled with magnon in a dispersive interaction which produces both level repulsion and attraction by varying the magnon-photon frequency detuning. At resonance, the hybridized states are of linear polarization and circular polarization for level repulsion and level attraction respectively. As the detuning increases, the polarizations of level repulsion remain linear but those of level attraction vary from elliptical to linear polarizations. The temporal dynamics of level repulsion presents the beat-like behavior. The level attraction presents monotonous decay in the weak coupling regime but gives rise to instability in the strong coupling regime due to the magnon amplification. As the detuning is large, both magnon and photon amplitudes present a synchronizing oscillation. Our results are important for exploring the temporal evolution of magnon-photon coupling in the range of optical frequency and designing magnon-based timing devices.
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. NSFC61974067 and 62374087). We thank Prof. Ke Xia and Prof. C. M. Hu for their helpful comments in doing this work.
Corresponding Authors:
Yang Xiao
E-mail: fryxiao@nuaa.edu.cn
Cite this article:
Yun-Jing Ding(丁云静) and Yang Xiao(肖杨) Eigenstates and temporal dynamics in cavity optomagnonics 2023 Chin. Phys. B 32 107601
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