Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 38: Ultrafast Magnetization Effects II
MA 38.13: Vortrag
Mittwoch, 11. März 2026, 18:15–18:30, POT/0361
Pump-induced out-of-equilibrium magnetism in the Mott insulator CuO — •Katja Sophia Moos1,2, Yun Yen2, Gian Parusa1,2, Arnau C. Romaguera3, Elia Razzoli3, Hiroki Ueda3, and Michael Schüler1,2 — 1Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland — 2Center for Scientific Computing, Theory and Data, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland — 3Center for Photon Science, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
Understanding ultrafast magnetism requires tracking energy flow among coupled electronic, spin, and lattice subsystems. Using time-resolved resonant diffuse scattering combined with complementary X-ray techniques and quantum-kinetic simulations, we reveal microscopic pathways of pump-induced demagnetization in the antiferromagnetic Mott insulator CuO. Above-bandgap photoexcitation creates non-thermal magnons across the Brillouin zone within tens of femtoseconds, followed by magnon-magnon scattering driving quasi-thermalization within picoseconds. Magnetic recovery occurs via magnon-phonon coupling on nanoseconds, constrained by dispersion mismatches imposing intrinsic bottlenecks. Our momentum-resolved quantum Boltzmann simulations establish a hierarchical energy-transfer framework beyond phenomenological multi-temperature models, reproducing key features of the experiments. This approach provides design principles for controlling non-equilibrium magnetic states and highlights time-resolved resonant diffuse scattering as a power tool for ultrafast quantum materials research.
Keywords: Pump-induced demagnetization; Mott insulator; Magnetic recovery; Boltzmann simulations