We demonstrate that interactions can substantially undermine the free-particle description of magnons in ferromagnets on geometrically frustrated lattices. The anharmonic coupling, facilitated by the Dzyaloshinskii-Moriya interaction, and a highly-degenerate two-magnon continuum yield a strong, non-perturbative damping of the high-energy magnon modes. We provide a detailed account of the effect for the S=1/2 ferromagnet on the kagom\'e lattice and propose further experiments.
@article{arxiv.1606.09249,
title = {Damped Topological Magnons in the Kagom\'{e}-Lattice Ferromagnets},
author = {A. L. Chernyshev and P. A. Maksimov},
journal= {arXiv preprint arXiv:1606.09249},
year = {2016}
}
Comments
4.5 p + 4 figs main, 8 p + 16 figs supplemental, typos corrected