Damped Topological Magnons in the Kagome-Lattice Ferromagnets.
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, nonperturbative damping of the high-energy magnon modes. We provide a detailed account of the effect for the S=1/2 ferromagnet on the kagome lattice and propose further experiments.
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
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Chernyshev
Department of Physics and Astronomy, University of California, Irvine, California 92697, USA.
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Maksimov