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arXiv · 2511.01667

Observation of Long-Lifetime Magnon Pairs by Fano Resonance of Photons

Qian-Nan Huang·Zhiping Xue·Tao Yu
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Abstract

Mode fluctuations with a long lifetime are essential for quantum information and logic operations in magnonic devices. We probe the broadband nonlinear magnetization dynamics of a high-quality ferromagnet under a strong microwave drive using microwave spectroscopy. We observe an \textit{unexpected} Fano resonance in the microwave transmission when the driven amplitude of the magnetization is large and the drive frequency $\omega_d$ is close to but not at the ferromagnetic resonance. We interpret this Fano resonance by a scattering theory of photons considering the three-magnon interaction between the Kittel magnon and magnon pairs with opposite wave vectors of frequency $\omega_d/2$. The theoretical model suggests that the microwave spectroscopy measures the dynamics of the fluctuation $\delta \hat{\alpha}$ of the Kittel magnon and $\delta\hat{\beta}_{\pm k}$ of the magnon pairs over the driven steady states, which are coupled coherently by the steady-state amplitudes. With the damping of $\delta\hat{\beta}_{\pm k}$ much smaller than that of $\delta \hat{\alpha}$, the theoretical calculation well reproduces the observed Fano resonance, indicating the magnon pairs hold a recorded long lifetime.

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Qian-Nan Huang, Zhiping Xue, Tao Yu. 2025-11-03. Observation of Long-Lifetime Magnon Pairs by Fano Resonance of Photons. https://arxiv.org/abs/2511.01667

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