24-27 November 2022
Karlsruhe Institute of Technology
Europe/Berlin timezone

Lattice-driven femtosecond magnon dynamics in α-MnTe investigated with linear spin wave theory

26 Nov 2022, 16:00
2h
Foyer (KIT Campus South)

Foyer

KIT Campus South

KIT Campus map: https://www.kit.edu/campusplan/ Building: 30.22 Room: Foyer im 1. und 2. OG Address: Institute of Technology, Engesserstraße 7, 76131 Karlsruhe Coordinates: 49.01244, 8.41062
Poster Physics Posters Poster session

Speaker

Kira Deltenre (Department of Physics, TU Dortmund University, D-44227 Dortmund)

Description

The femtosecond sublattice dynamics in the antiferromagnetically ordered phase of the semiconductor $\alpha$-MnTe are calculated using the linear spin wave theory [1]. We assume that collective lattice vibrations generated by laser pulses induce an oscillating Heisenberg coupling and thus a driving that generates magnons. The calculated antiferromagnetic order parameter shows damped coherent longitudinal oscillations, which decay due to dephasing. We also include a phenomenological dissipative term to describe spin-lattice relaxation processes, which lead to relaxation back to thermal equilibrium. In addition, we provide approximate analytic solutions of the differential equations to understand the effect of the amplitude, frequency, and lifetime of the driving.

[1] K. Deltenre, D. Bossini, F. B. Anders, and G. S. Uhrig, Phys. Rev. B 104, 184419 (2021)

Category Solid State (Theory)

Primary authors

Kira Deltenre (Department of Physics, TU Dortmund University, D-44227 Dortmund) Götz S. Uhrig (Department of Physics, TU Dortmund University, D-44227 Dortmund) Frithjof B. Anders (Department of Physics, TU Dortmund University, D-44227 Dortmund)

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