Speaker
Description
In this work, we explore how a magnon Bose–Einstein condensate (BEC) responds to external perturbations and how its stability and lifetime can be controlled. The magnon BEC is created by populating the magnon gas above the thermal equilibrium level using pulsed parallel parametric pumping. A second pulse at a different frequency—with its parametric excitation frequency tuned from below the spectral minimum to above the ferromagnetic resonance frequency—is then applied to the already formed condensate. This additional pulse enables a controlled perturbation of the non-equilibrium spin system and, thereby, engineering of the magnon excitation and the thermalization process. The condensate dynamics are studied using frequency-, time-, and wavevector-resolved Brillouin light scattering spectroscopy. This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)-TRR 173/3-268565370 Spin+X (Project B04 and B13).
