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Optical excitations of Skyrmions, knotted solitons, and defects in atoms

Parmee, Christopher D., Dennis, Mark R., Ruostekoski, Janne·2022·Communications Physics

Abstract

Analogies between non-trivial topologies of matter and light have inspired numerous studies, including defect formation in structured light and topological photonic band structures. Three-dimensional topological objects of localised particle-like nature attract broad interest across discipline boundaries from elementary particle physics and cosmology to condensed matter physics. Here we propose how simple structured light beams can be transformed into optical excitations of atoms with considerably more complex topologies representing three-dimensional particle-like Skyrmions. This construction can also be described in terms of linked Hopf maps, analogous to knotted solitons of the Skyrme-Faddeev model. We identify the transverse polarisation density current as the effective magnetic gauge potential for the Chern-Simons helicity term. While we prepare simpler two-dimensional baby-Skyrmions and singular defects using the traditional Stokes vectors on the Poincaré sphere for light, particle-like topologies can only be achieved in the full optical hypersphere description that no longer discards the variation of the total electromagnetic phase of vibration.

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Crossref · 10.1038/s42005-022-00829-y

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  • Optical skyrmions can interact with magnetic skyrmions, allowing a route to manipulate these magnetic particles.

    “Optical skyrmions can interact with magnetic skyrmions allowing for a route to manipulate these magnetic particles [103][104][105].”

    From Optical skyrmions and other topological quasiparticles of light (2024) · cites this paper as [105]

    The Baby-Skyrmions section describes optical fields used to prepare skyrmionic textures in an atomic ensemble, and the 3D Skyrmions section discusses light–matter coupling. Neither the supplied passages nor searches for magnetic-skyrmion interaction and manipulation address optical skyrmions interacting with magnetic skyrmions to manipulate them. No page numbers were provided in our copy. (LLM, conf=0.76)

    Experimental — accuracy not yet measured
  • The space of continuous maps from S2 to S2 is partitioned into equivalence classes, where maps in the same class can be continuously deformed into each other and maps in distinct classes cannot.

    “An important corollary of the existence of a topological invariant is that the space of continuous maps is partitioned into equivalence classes [40].Any two maps in the same class can be continuously deformed into each other, while this is not possible for maps in distinct classes [40].”
  • Skyrmions can be driven by the skyrmion Hall effect, spin-orbit torque, and light.

    “and can be driven by the skyrmion Hall effect [61,62], spin-orbit torque [99,100], and even the light [101][102][103][104][105].”

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Metadata

Authors
Parmee, C. D., Dennis, M. R., & Ruostekoski, J.
Venue
Communications Physics
Published
2022-03-14
Volume
5
Issue
1
ISSN
2399-3650
Cited by
40
References
2
Language
en
Funders
RCUK | Engineering and Physical Sciences Research Council (EP/S002952/1, EP/P026133/1, EP/S02297X/1)

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