Damped Topological Magnons in the Kagom\'{e}-Lattice Ferromagnets
classification
❄️ cond-mat.str-el
keywords
ferromagnetskagomlatticemagnonsaccountanharmoniccontinuumcoupling
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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.
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