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Effects of magnonic Kerr nonlinearity on magnon-polaritons with a soft-mode
Takahiro Chiba·February 13, 2026·DOI: 10.1063/9.0000970
Mesoscale Physicsnlin.CDQuantum Physics
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Abstract
We theoretically study the effects of magnonic Kerr nonlinearity on magnon-polaritons (MPs) with a soft-mode in easy-axis ferromagnets coupled to a microwave cavity. Using an effective circuit model capable of describing MPs up to the nonperturbative strong-coupling regime, we show that chaotic and frequency-comb-like behaviors of MPs emerge at the original modes crossing point. Furthermore, we demonstrate that the Kerr nonlinearity induces a finite excitation gap in the soft-mode, particularly in the strong-coupling regime.