Skyrmion-antiSkyrmion pairs in Ultracold Atomic Gases

Abstract

We study theoretically the dynamics of two-component Bose-Einstein condensates in two dimensions, which admit topological excitations related to the Skyrmions of nuclear physics. We show that there exists a branch of uniformly propagating solitary waves characterised by a conserved momentum. These excitations exhibit a cross-over from spatially extended spin-wave states at low momentum to a localised "spin-wave droplet" at intermediate momentum; at still higher momentum, the configuration evolves continuously into a Skyrmion-antiSkyrmion pair. We discuss how these solitary waves can be generated and studied in experiment.

References in corpus (2)

• Coherent atomic soliton molecules for matter-wave switching
• Neutral skyrmion configurations in the low-energy effective theory of spinor condensate ferromagnets

Cited by in corpus (5)

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• Current-controlled creations, deletions, and topological transformations of a single magnetic antiskyrmion in nanostructured cells
• Sub-wavelength spin excitations in ultracold gases created by stimulated Raman transitions
• Hydrodynamic generation of skyrmions in a two-component Bose-Einstein condensate