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arXiv · 2507.08147

Exciting terahertz magnons with amplitude modulated light: spin pumping, squeezed states, symmetry breaking and pattern formation

Egor I. Kiselev·Jonas F. Karcher·Mark S. Rudner·Rembert Duine·Netanel H. Lindner
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Abstract

We show how amplitude modulated, coherent high-frequency drives can be used to access otherwise difficult to reach collective resonances and off-resonantly induce parametric instabilities. In particular, we demonstrate that difficult to access antiferromagnetic resonances in the THz range can be parametrically excited with signals at optical frequencies via a mechanism that we call Modulated Floquet Parametric Driving (MFPD). We study spin pumping and the formation of entangled, two-mode squeezed magnon pairs in anisotropic antiferromagnets under MFPD. Furthermore, we show that MFPD induces transitions to symmetry breaking steady-states in which dynamical spin patterns are formed by resonant magnon pairs.

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Egor I. Kiselev, Jonas F. Karcher, Mark S. Rudner, Rembert Duine, Netanel H. Lindner. 2025-07-10. Exciting terahertz magnons with amplitude modulated light: spin pumping, squeezed states, symmetry breaking and pattern formation. https://arxiv.org/abs/2507.08147

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