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MA: Fachverband Magnetismus

MA 7: Poster Magnetism I

MA 7.9: Poster

Montag, 9. März 2026, 09:30–12:30, P2

Switching the magnetization of quantum antiferromagnets: Schwinger boson mean-field approximation gauged with exact diagonalization — Florian Johannesmann, •Asliddin Khudoyberdiev, and Götz S. Uhrig — Condensed Matter Theory, TU Dortmund University, Otto-Hahn-Straße 4, 44227 Dortmund, Germany

For operation on the THz scale, antiferromagnets (AFM) are preferable to commonly used ferromagnets. Also, the lack of stray fields allows for much higher densities of bits. Still, efficient switching of the AFM order and the control of its orientation remain one of the main challenges for applications. Recently, we developed a time-dependent Schwinger boson mean-field theory, to study the sublattice magnetization in anisotropic quantum AFMs [1,2]. To corroborate the obtained results, we compare the short-time dynamics of the mean-field approach to exact numerical calculations for small clusters. We obtained a good agreement: The numerical approach corroborates our mean-field findings, with only about 6 % deviations.

[1] K. Bolsmann, A. Khudoyberdiev, and G. S. Uhrig, PRX Quantum 4, 030332 (2023) [2] A. Khudoyberdiev and G. S. Uhrig, Phys. Rev. B 109, 174419 (2024); Phys. Rev. B 111, 064408 (2025); SciPost Phys. 19, 117 (2025)

Keywords: Antiferromagnets, switching the magnetization; Control of N\'eel vector; Schwinger mean-field approximation; exact diagonalization; Ultrafast switching