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arXiv · 2305.06896

Correlation-enhanced interaction of a Bose-Einstein condensate with parametric magnon pairs and virtual magnons

Victor S. L'vov·Anna Pomyalov·Dmytro A. Bozhko·Burkard Hillebrands·Alexander A. Serga
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Abstract

Nonlinear interactions are crucial in science and engineering. Here, we investigate wave interactions in a highly nonlinear magnetic system driven by parametric pumping leading to Bose--Einstein condensation of spin-wave quanta -- magnons. Using Brillouin light scattering spectroscopy in yttrium-iron garnet films, we found and identified a set of nonlinear processes resulting in off-resonant spin-wave excitations -- virtual magnons. In particular, we discovered a dynamically-strong, correlation-enhanced four-wave interaction process of the magnon condensate with pairs of parametric magnons having opposite wavevectors and fully correlated phases.

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Victor S. L'vov, Anna Pomyalov, Dmytro A. Bozhko, Burkard Hillebrands, Alexander A. Serga. 2023-05-11. Correlation-enhanced interaction of a Bose-Einstein condensate with parametric magnon pairs and virtual magnons. https://doi.org/10.1103/physrevlett.131.156705

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