Phasons and excitations in skyrmion lattice

Abstract

Excitations of two-dimensional skyrmion lattice are theoretically studied based on a collective coordinate description. Starting from the representation of skyrmion lattice in terms of three helices, we identify the canonical coordinates describing low energy excitations as phasons. The phason excitation spectra turn out to have one gapless mode with a quadratic dispersion and one massive mode, in agreement with previous studies. We will show that there is another collective mode governing the topological nature and the stability of skyrmion lattice and that the fluctuation of this mode leads to a screening of the topological charge of the lattice. Experimental implications of the screening effect in microwave absorption, topological Hall effect and depinning threshold current in metals are discussed.

References in corpus (4)

• Theory of current-driven motion of Skyrmions and spirals in helical magnets
• Microscopic approach to current-driven domain wall dynamics
• Thermally Driven Ratchet Motion of Skyrmion Microcrystal and Topological Magnon Hall Effect
• Current-driven resonant excitation of magnetic vortex

Cited by in corpus (7)

• Theory of magnetic skyrmion glass
• Spontaneous antiferromagnetic skyrmion/antiskyrmion lattice and spiral spin liquid states in the frustrated triangular lattice
• Skyrmion lattice hosted in synthetic antiferromagnets and helix modes
• Phase shifts, band geometry and responses in triple-Q charge and spin density waves
• Unraveling the dynamics of magnetization in topological insulator-ferromagnet heterostructures via spin-orbit torque
• Magnons in the fan phase of anisotropic frustrated antiferromagnets
• Ferromagnetic monolayer with interfacial Dzyaloshinskii-Moriya interaction: magnon spectrum and effect of quenched disorder