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MA: Fachverband Magnetismus
MA 31: Poster II
MA 31.32: Poster
Mittwoch, 19. März 2025, 17:00–19:30, P1
Ultrafast dynamics in photoexcited antiferromagnets — •Katja Sophia Moos1, Yun Yen2, Arnau C. Romaguera3, Hiroki Ueda3, and Michael Schüler1,2 — 1Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland — 2PSI Center for Scientific Computing, Theory and Data, 5232 Villigen PSI, Switzerland — 3PSI Center for Photon Science, 5232 Villigen PSI, Switzerland
State-of-the-art time-resolved probes provide unprecedented access to the dynamics of interacting quasiparticles in solids on their natural time scales. Although a significant body of work exists on the dynamics of electrons and phonons, much less is known about the ultrafast response of magnetic moments. Here, we study pump-induced out-of-equilibrium magnetism in the Mott insulator CuO, combining measurements of resonant magnetic X-ray scattering with quantum-kinetic simulations. In particular, the diffuse scattering reveals time-dependent magnetic correlations, which we interpret in terms of interacting magnons. For quantitative insights, we solve the time-dependent quantum Boltzmann equation to study magnon-magnon scattering. The calculations are consistent with experimental observations and provide a detailed picture of magnetic dynamics in terms of non-thermal magnons and their subsequent thermalization.
Keywords: Magnons; Ultrafast dynamics; Mott insulator; Quantum Boltzmann equation