Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 48: Magnonics II
MA 48.8: Talk
Thursday, March 12, 2026, 17:00–17:15, HSZ/0004
Stability of a magnon Bose-Einstein condensate under two-tone pumping — •Franziska Kühn1, Lars Schießer1, Matthias R. Schweizer1, Vitaliy I. Vasyuchka1, Georg von Freymann1, 2, Mathias Weiler1, Burkard Hillebrands1, and Alexander A. Serga1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, RPTU Kaiserslautern-Landau, 67663 Kaiserslautern, Germany — 2Fraunhofer Institute for Industrial Mathematics ITWM, Fraunhofer Platz 1, 67663 Kaiserslautern, Germany
In our work we investigate the stability of magnon Bose-Einstein condensates (BEC) in yttrium-iron-garnet films under two-tone pumping. First, to create a magnon BEC, the magnon gas is populated above the thermal level by external injection of magnons through parametric pumping. For flexible control of the excitation conditions, we employ a broadband microstrip antenna, allowing continuous tuning of the pumping frequencies. Second, after the magnon BEC is formed, its stability is tested by disturbing it with a second pumping pulse at a lower frequency. By shaking the magnon system without generating additional magnons, we aim to properly identify stability conditions of the magnon BEC in a time-varying environment. The measurements are performed using wave vector resolved Brillouin light scattering spectroscopy as an optical detection method for magnons. This research was funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)-TRR 173/3-268565370 Spin+X (Project B04 and B13).
Keywords: Spin Waves; Bose-Einstein Condensate; Parametric Pumping; Brillouin Light Scattering Spectroscopy