Tunable skyrmion crystals and topological quantum oscillations in magnetic metals
arXiv:1810.08207 · doi:10.1103/PhysRevB.100.174411
Abstract
Skyrmions are spatially localized magnetic swirls which carry a nonzero integer topological charge. We study crystals of skyrmions in a two-dimensional ferromagnet model with chiral interactions induced by the presence of broken inversion symmetry. We show that non-linear quartic mode-coupling terms allowed by symmetry enhances the Zeeman-field range over which the skyrmion-crystal phase remains stable. Furthermore, it leads to a significant dependence of the lattice constant of this spin crystal over this wide field range. Conduction electrons coupled to such a tunable spin crystal are shown to experience a Berry-flux density which varies with the Zeeman field. Such tunable skyrmion crystals provide a distinct realization of a Berry-Hofstadter butterfly, resulting in a phenomenon we term "topological quantum oscillations" in the electronic density of states and associated observables.
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Cited by in corpus (6)
- New Microscopic Magnetic Hamiltonian for Exotic Spin Textures in Metals
- Magnetic skyrmion crystal at a topological insulator surface
- Topological magnetic textures in magnetic topological insulators
- Dimension transcendence and anomalous charge transport in magnets with moving multiple- spin textures
- Resonant optical topological Hall conductivity from skyrmions
- Charge ordering and spontaneous topological Hall effect in bilayer skyrmion crystals