Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 63: Nonlinear Stochastic Systems

DY 63.5: Talk

Friday, March 13, 2026, 12:30–12:45, ZEU/0118

Universal Kardar-Parisi-Zhang scaling in non-equilibrium magnon condensates — •Alexander Wowchik and Achim Rosch — Institute for Theoretical Physics, University of Cologne, Zülpicher Str. 77, 50937 Köln, Germany

Extensive studies in the past decade have unveiled how driven-dissipative condensates in one and two dimensions can form a unique non-equilibrium phase of matter characterized by a Kardar-Parisi-Zhang (KPZ) equation for the emergent Goldstone modes. We investigate whether the condensation of magnons, as demonstrated in Yttrium Iron Garnet (YIG) films when driven with microwave radiation, is a suitable candidate to study such phenomena. Via micromagnetic simulations of a corresponding system, we show that, after strong initial pumping, the dynamical autocorrelation function of the magnon field exhibits the universal scaling exponent predicted by the KPZ equation.

Keywords: KPZ; Field theory; Condensation; Non-equilibrium; Magnons