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MA: Fachverband Magnetismus
MA 26: Ultrafast Magnetization Effects I
MA 26.13: Vortrag
Mittwoch, 19. März 2025, 18:15–18:30, H16
Ultrafast electron dynamics in altermagnetic materials — Marius Weber1,2, •Kai Leckron1, Luca Haag1, Libor Šmejkal2, Jairo Sinova2, and Hans Christian Schneider1 — 1Department of Physics, University of Kaiserslautern-Landau, Germany — 2Institut für Physik, Johannes Gutenberg University Mainz, Germany
One of the intriguing properties of altermagnetic materials is that a linearly polarized optical pulse can induce a spin polarization of the electrons depending on the direction of the linear polarization [1]. This contribution investigates the impact of the polarization direction and fluence of the optical excitation on the ultrafast magnetization dynamics in the prototypical altermagnetic band structure of KRu4O8. We explicitly consider electron-electron scattering and electron-phonon scattering contributions to the light-driven carrier dynamics. The optical excitation is computed using ab initio dipole transition rates in the whole Brillouin zone. Our momentum-dependent calculation of the subsequent scattering dynamics fully includes the anisotropies of the altermagnet, which leads to unique k-resolved electron dynamics at ultrashort times and a long-lived spin polarization [2]. We present a numerical study of the influence of the excitation conditions on the lifetime of this spin polarization.
[1] M. Weber et al., arXiv:2408.05187 (2024) [2] M. Weber et al., arXiv:2411.08160 (2024)
Keywords: ultrafast; altermagnet; electron dynamics; ab initio optical excitation; momentum resolved calculation