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We theoretically study spin and charge excitations of skyrmion crystalsstabilized by conduction-electron-mediated magnetic interactions viaspin-charge coupling in a centrosymmetric Kondo-lattice model by large-scalespin-dynamics simulations combined with the kernel polynomial method. We revealclear segregation of spin and charge excitation channels and nonreciprocalnature of the spin excitations governed by the Fermi-surface geometry, whichare unique to the skyrmion crystals in centrosymmetric itinerant hosts and canbe a source of novel physical phenomena.

Low-Energy Excitations of Skyrmion Crystals in a Centrosymmetric Kondo-Lattice Magnet: Decoupled Spin-Charge Excitations and Nonreciprocity