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

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.

7 pages, 4 figures

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Cited by in corpus (13)

• Widely-sweeping magnetic field-temperature phase diagrams for skyrmion-hosting centrosymmetric tetragonal magnets
• Ferroaxial moment induced by vortex spin texture
• Skyrmion and vortex crystals in the Hubbard model
• Stability of Skyrmion Crystal Phase in Centrosymmetric Distorted Triangular-Lattice Antiferromagnets
• Equivariant Neural Networks for Spin Dynamics Simulations of Itinerant Magnets
• Antiferro skyrmion crystal phases in a synthetic bilayer antiferromagnet under an in-plane magnetic field
• Theory of collective excitations in the quadruple-$Q$ magnetic hedgehog lattices
• Field-induced transformation between triangular and square skyrmion crystals in a tetragonal polar magnet
• Three-sublattice antiferro-type and ferri-type skyrmion crystals in centrosymmetric magnets
• Dynamical and Static Structure Factors in Hedgehog-Antihedgehog Order in Icosahedral 1/1 Approximant Crystal
• Field-tunable quadruple-$Q$ states driven by momentum-space frustration
• Stacking-dependent nonreciprocal transport in magnetic skyrmions
• Emergence of topological defects and spin liquid in a two-orbital spin-fermion model on the honeycomb lattice