Tunable skyrmion crystals and topological quantum oscillations in magnetic metals

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 nonlinear quartic mode-coupling terms...

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Published in:Physical review. B 2019-11, Vol.100 (17), p.174411, Article 174411
Main Authors: Sorn, Sopheak, Divic, Stefan, Paramekanti, Arun
Format: Article
Language:English
Subjects:
Conduction electrons
Crystal lattices
Crystals
Ferromagnetism
Flux density
Hypothetical particles
Lattice parameters
Oscillations
Particle theory
Symmetry
Topology
Two dimensional models
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Paramekanti, Arun
description 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 nonlinear quartic mode-coupling terms allowed by symmetry enhance 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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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects Conduction electrons
Crystal lattices
Crystals
Ferromagnetism
Flux density
Hypothetical particles
Lattice parameters
Oscillations
Particle theory
Symmetry
Topology
Two dimensional models
title Tunable skyrmion crystals and topological quantum oscillations in magnetic metals
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