Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 52: Altermagnets
MA 52.5: Talk
Friday, March 22, 2024, 10:30–10:45, EB 202
Ultrafast electron dynamics in altermagnetic KRu4O8 — •Marius Weber1,2, Kai Leckron1, Luca Haag1, Rodrigo Jaeschke2, Libor Šmejkal2, Jairo Sinova2, and Hans Christian Schneider1 — 1Department of Physics and Research Center OPTIMAS, University of Kaiserslautern-Landau ,67633 Kaiserslautern, Germany — 2Institut für Physik, Johannes Gutenberg University Mainz, 55099 Mainz, Germany
Altermagnetic materials [1] exhibit various intriguing properties, including a distinctive anisotropic band-structure landscape with an alternating spin arrangement. We present here a numerical investigation of optically-induced electronic dynamics in altermagnetic KRu4O8. Ab-initio band structure and the corresponding dipole matrix elements are used as input to determine optically excited carrier distributions from a Fermi's Golden Rule approach. To investigate the characteristics of electronic dynamics in altermagnets, it is crucial to compute the microscopic momentum-dependent scattering dynamics throughout the whole Brillouin zone. We utilize a tight-binding model and calibrate the model parameters to the DFT band structure, which captures the essential momentum-space characteristics of KRu4O8. We numerically determined the electron dynamics resulting from electron-phonon [2] and electron-electron interactions. We characterize the influence on charge and spin dynamics dynamics throughout the entire Brillouin zone, and highlight the importance Elliot-Yafet spin flips.
[1] L. Šmejkal et al.; Phys. Rev. X 12, 031042 (2022)
[2] M. Weber et. al.; arXiv:2305.00775
Keywords: Altermagnet; Ultrafast