Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 25: Ultrafast Magnetization Effects 2
MA 25.3: Vortrag
Mittwoch, 7. September 2022, 15:30–15:45, H43
Spin-dependent carrier dynamics in antiferromagnetic model systems — •Marius Weber1, Kai Leckron1, Benjamin Stadtmüller1,2, Baerbel Rethfeld1, and Hans Christian Schneider1 — 1Department of Physics and Research Center OPTIMAS, TU Kaiserslautern — 2Institute of Physics, Johannes Gutenberg University Mainz
The Elliot-Yafet mechanism for the relaxation of an electronic spin polarization was originally derived for the electron-phonon scattering in degenerate bands in semiconductors [1]. Recently, we investigated how the concept of Elliott-Yafet spin-flip scattering can be applied to a microscopic treatment of carrier scattering in ferromagnetic metals including a ferromagnetic splitting and spin-orbit coupling [2].
Here we use the microscopic approach of [2], which utilizes the equation of motion formalism for the k-resolved reduced spin density matrix, to calculate the electronic dynamics in antiferromagnets such as the minimal model system discussed in [3]. The band structure of this model is anisotropic with two twofold degenerate bands and pronounced spin mixing. We investigate the spin-resolved electronic dynamics for different scenarios of spin-polarized anisotropic excitation, such as spin injection and k-selective spin flips.
[1] R. J. Elliott; Physical Review 96, 266, (1954).
[2] K. Leckron et al.; Phys. Rev. B 96, 140408 (2017).
[3] L. Smejkal et al.; Phys. Status Solidi RRL, 11 (2017).