Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 28: Magnonics 2
MA 28.10: Vortrag
Donnerstag, 8. September 2022, 11:45–12:00, H43
Lattice-driven femtosecond magnon dynamics in α-MnTe — •Kira Deltenre1, Davide Bossini2, Mirko Cinchetti1, Götz S. Uhrig1, and Frithjof B. Anders1 — 1Department of Physics, TU Dortmund University, D-44227 Dortmund — 2Department of Physics and Center for Applied Photonics, University of Konstanz, D-78457 Konstanz
The femtosecond dynamics of the sublattice magnetizations in the antiferromagnetically ordered phase of α-MnTe is investigated theoretically with linear spin wave theory as a function of an external drive [1]. We assume that collective coherent lattice vibrations generated by laser pulses induce an oscillating Heisenberg coupling thus inducing the driving. The calculated dynamics of the antiferromagnetic order parameter exhibits damped coherent longitudinal oscillations, which decay due to dephasing. The frequency of the oscillations is determined by the external driving phonon. We make contact to experiments [2] by analyzing the spin dynamics for realistic parameters and discussing the effect of oscillating Heisenberg couplings between different types of (next-)nearest neighbors.
[1] K. Deltenre, D. Bossini, F. B. Anders, and G. S. Uhrig, Phys. Rev. B 104, 184419 (2021)
[2] D. Bossini, S. D. Conte, M. Terschanski, G. Springholz, A. Bonanni, K. Deltenre, F. Anders, G. Uhrig, G. Cerullo, and M. Cinchetti, Phys. Rev. B 104, 224424 (2021)