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arXiv · 2112.04508

Giant Resonant Self-Blocking in Magnetophononically Driven Quantum Magnets

M. Yarmohammadi·M. Krebs·G. S. Uhrig·B. Normand
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Abstract

Magnetophononics, the modulation of magnetic interactions by driven infrared-active lattice excitations, is emerging as a key mechanism for the ultrafast dynamical control of both semiclassical and quantum spin systems by coherent light. We demonstrate that, in a quantum magnetic material with strong spin-phonon coupling, resonances between the driven phonon and the spin excitation frequencies exhibit a giant self-blocking effect. Instead of absorbing more energy, the spin system acts as a strong brake on the driven phonon, causing it to absorb only a tiny fraction of the power available from the laser. Using the quantum master equations governing the nonequilibrium steady states of the coupled spin-lattice system, we show how self-blocking dominates the dynamics, demonstrate the creation of mutually repelling hybrid spin-phonon states, and control the nonequilibrium renormalization of the lattice-driven spin excitation band.

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M. Yarmohammadi, M. Krebs, G. S. Uhrig, B. Normand. 2021-12-08. Giant Resonant Self-Blocking in Magnetophononically Driven Quantum Magnets. https://arxiv.org/abs/2112.04508

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