Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 23: Ultrafast Electron Dynamics at Surfaces and Interfaces III
O 23.11: Vortrag
Dienstag, 19. März 2024, 13:00–13:15, MA 041
Ultrafast Electron-Phonon Scattering in Dirac Antiferromagnets — Marius Weber1,2, •Kai Leckron1, Bärbel Rethfeld1, and Hans Christian Schneider1 — 1Department of Physics and Research Center OPTIMAS University of Kaiserslautern - Landau, Campus Kaiserslautern, Germany — 2Institut für Physik, Johannes Gutenberg University Mainz, Germany
In topological antiferromagnets the corresponding band and spin structure strongly depends on the orientation of the order parameter, for instance, two Dirac-cones with nearly linear dispersion at the border of the Brillouin zone for in-plane orientation of the Néel-vector may become a gapped system in another direction. This poses a challenge for the calculations of the electronic dynamics in these bandstructures, but the problem also applies more generally to all cases in which the electronic dynamics in the whole Brillouin zone are of interest and in which the bandstructure exhibits pronounced anisotropies. For this case and effectively 2D momentum spaces, we have developed a numerical approach which we present here for electron dynamics due to electron-phonon interactions in a model antiferromagnet. After a simulated instantaneous excitation of the electronic system, which leads to anisotropic carrier distributions, we demonstrate the effects of anisotropy on the electronic distribution functions and on macroscopic quantities like magnetization, and band-resolved carrier densities. We highlight the numerical accuracy of our implementation of the electron-phonon scattering which fully accounts for the density conservation requirements necessary for a dynamic spin-resolved calculation.