Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 19: Many-body Quantum Dynamics I (joint session DY/TT)

TT 19.10: Vortrag

Dienstag, 18. März 2025, 12:00–12:15, H37

One magnon magnetization dynamics for the kagome lattice antiferromagnet — Henrik Schlüter, •Jannis Eckseler, and Jürgen Schnack — Faculty of Physics, Bielefeld University, Bielefeld, Germany

We present aspects of the one-magnon dynamics of the antiferromagnetic kagome lattice as an example of flat-band dynamics extending the work of [1] to two dimensional systems. We illustrate how localized eigenstates also called localized magnons [2] influence the dynamics of excitations and possibly prevent the system from thermalization. To this end we introduce a J₁−J₂-model for the kagome lattice which guarantees the stability of one out of three localized magnons and lets us distinguish the different flat bands.

[1] F. Johannesmann, J. Eckseler, H. Schlüter, and J. Schnack, Phys. Rev. B 108, 064304 (2023).

[2] J. Schnack, H.-J. Schmidt, J. Richter, and J. Schulenburg, Eur. Phys. J. B 24, 475 (2001).

Keywords: kagome; localization