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

TL;DR

This paper theoretically investigates the distinct spin and charge excitations in skyrmion crystals within a centrosymmetric Kondo-lattice model, highlighting their nonreciprocal behavior influenced by Fermi-surface geometry, which could lead to new physical phenomena.

Contribution

It uncovers the decoupled spin-charge excitation channels and nonreciprocal spin excitations in skyrmion crystals, a novel insight specific to centrosymmetric itinerant magnetic systems.

Findings

Segregation of spin and charge excitation channels.

Nonreciprocal spin excitations governed by Fermi-surface geometry.

Potential for novel physical phenomena in skyrmion crystals.

Abstract

We theoretically study spin and charge excitations of skyrmion crystals stabilized by conduction-electron-mediated magnetic interactions via spin-charge coupling in a centrosymmetric Kondo-lattice model by large-scale spin-dynamics simulations combined with the kernel polynomial method. We reveal clear segregation of spin and charge excitation channels and nonreciprocal nature of the spin excitations governed by the Fermi-surface geometry, which are unique to the skyrmion crystals in centrosymmetric itinerant hosts and can be a source of novel physical phenomena.