title: Topological excitations in a kagome magnet.
abstract: Chirality--that is, left or right handedness--is present in many scientific areas, and particularly in condensed matter physics. Inversion symmetry breaking relates chirality with skyrmions, which are protected field configurations with particle-like and topological properties. Here we show that a kagome magnet, with Heisenberg and Dzyaloshinskii-Moriya interactions, causes non-trivial topological and chiral magnetic properties. We also find that under special circumstances, skyrmions emerge as excitations, having stability even at room temperature. Chiral magnonic edge states of a kagome magnet offer, in addition, a promising way to create, control and manipulate skyrmions. This has potential for applications in spintronics, that is, for information storage or as logic devices. Collisions between these particle-like excitations are found to be elastic at very low temperature in the skyrmion-skyrmion channel, albeit without mass-conservation. Skyrmion-antiskyrmion collisions are found to be more complex, where annihilation and creation of these objects have a distinct non-local nature.
authors.affiliation: Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala 751 20, Sweden.
authors.forename: Manuel
authors.initials: M
authors.lastname: Pereiro
authors.affiliation: Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala 751 20, Sweden.
authors.forename: Dmitry
authors.initials: D
authors.lastname: Yudin
authors.affiliation: Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala 751 20, Sweden.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Chico
authors.affiliation: Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala 751 20, Sweden.
authors.forename: Corina
authors.initials: C
authors.lastname: Etz
authors.affiliation: Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala 751 20, Sweden.
authors.forename: Olle
authors.initials: O
authors.lastname: Eriksson
authors.affiliation: Department of Physics and Astronomy, Uppsala University, PO Box 516, Uppsala 751 20, Sweden.
authors.forename: Anders
authors.initials: A
authors.lastname: Bergman