Correlation-Enhanced Interaction of a Bose-Einstein Condensate with Parametric Magnon Pairs and Virtual Magnons
Victor S. L’vov, Anna Pomyalov, Dmytro A. Bozhko, B. Hillebrands, A. A. Serga
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 wave vectors and fully correlated phases.
Topics & Concepts
MagnonBose–Einstein condensatePhysicsParametric statisticsCondensed matter physicsQuantum electrodynamicsQuantum mechanicsStatisticsMathematicsFerromagnetismMechanical and Optical ResonatorsMagneto-Optical Properties and ApplicationsQuantum optics and atomic interactions