- Letter
Pump-induced magnon anticrossing due to three-magnon splitting and confluence
Phys. Rev. B 111, L180410 – Published 23 May, 2025
DOI: https://doi.org/10.1103/PhysRevB.111.L180410
Abstract
We present a plausible mechanism for achieving a magnon-magnon level repulsion spectrum originating from the oscillation between the splitting and confluence in a three-magnon scattering process. When a magnetostatic mode on a YIG sphere is pumped by a microwave signal near the magnon resonance frequency with an increasing amplitude, the generated magnon condensate at half of the pumping frequency exerts a backaction to the original magnon mode. Such a strong nonlinear coupling manifests a striking feature of a “bending effect” of the magnetostatic mode spectra, akin to the anticrossing observed in a strongly coupled magnon-photon system.
