# SKM 2023 – wissenschaftliches Programm

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# MA: Fachverband Magnetismus

## MA 46: Ultrafast Magnetization Effects II

### MA 46.2: Vortrag

### Freitag, 31. März 2023, 09:45–10:00, HSZ 02

**Spin and momentum resolved ultrafast carrier dynamics in antiferromagnetic Dirac semimetal models** — •Marius Weber^{1}, Kai Leckron^{1}, Baerbel Rethfeld^{1}, Libor Šmejkal^{2}, Jairo Sinova^{2}, and Hans Christian Schneider^{1} — ^{1}Department of Physics and Research Center OPTIMAS, RPTU Kaiserslautern-Landau, Germany — ^{2}Institute of Physics, Johannes Gutenberg University Mainz, Germany

Systems with antiferromagnetic ordering in real space often exhibit topological features in momentum space that only recently have been investigated in a comprehensive fashion [1]. For instance, depending on the magnetic ordering, they may have band structures with a pronounced anisotropy in band energies and in the spin structure of their single-particle states due to Dirac fermions. We present numerical calculations of the electron dynamics due to electron-phonon interactions [2,3] in model systems with two-dimensional k-space that capture key properties of antiferromagnetic Dirac materials in momentum space. After an instantaneous heating of the electronic system we obtain a transient carrier distributions, which reflect the momentum-space features. Surprisingly, completely anisotropic carrier distribution may evolve, even from excited carrier distributions that are isotropic in energy, i.e., f(E(k)) = f(E).

[1] L. Šmejkal et al.; Phys. Rev. Let 118, 106402 (2017).

[2] K. Leckron et al.; Phys. Rev. B 96, 140408 (2017).

[3] S. Essert et al., Phys. Rev. B 84, 224405 (2011).