Dresden 2026 – scientific programme
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MA: Fachverband Magnetismus
MA 8: Altermagnets II
MA 8.6: Talk
Monday, March 9, 2026, 16:15–16:30, HSZ/0002
Optical Kerr Signatures in d-wave and g-wave Altermagnets — •Luca Felipe Haag1, Paul Herrgen1, Jairo Sinova2, Benjamin Stadtmüller3, Martin Aeschlimann1, and Hans Christian Schneider1 — 1Department of Physics and Research Center OPTIMAS, RPTU University Kaiserslautern-Landau, Germany — 2Institut für Physik, Johannes Gutenberg University, Mainz — 3Experimentalphysik II, Institute of Physics, University of Augsburg, Germany
The non-relativistic spin splitting in the electronic states of altermagnets makes them promising candidates for next-generation spintronic materials [1,2], but the identification and characterization of these materials is difficult. In a previous study, we demonstrated that altermagnets show intriguing time-dependent magneto-optical properties when probed by ultrashort pulses, which are linked to their particular spin symmetries [3]. In this contribution we analyze the pump-induced Kerr response of different candidate materials in detail. To this end, we theoretically investigate the probe response due to the pump induced birefringence and explain how to distinguish between anisotropic charge carrier distributions and magnetic signatures. Our results suggest that pump-probe Kerr microscopy is a viable tool to image the domain structure of specific altermagnets.
[1] Šmejkal et al., Phys. Rev. X 12, 040501 (2022) [2] Šmejkal et al., Phys. Rev. X 12, 031042 (2022) [3] Weber et al., arXiv:2408.05187 (2024)
Keywords: altermagnetism; ultrafast; optics; MOKE