Skyrmion-antiSkyrmion pairs in Ultracold Atomic Gases
H. M. Price, N. R. Cooper
TL;DR
This paper theoretically investigates the dynamics of topological excitations, including Skyrmion-antiSkyrmion pairs, in two-dimensional two-component Bose-Einstein condensates, revealing their properties and potential experimental realization.
Contribution
It introduces a new class of uniformly propagating solitary waves in Bose-Einstein condensates, connecting spin-wave states to Skyrmion-antiSkyrmion pairs, and discusses their experimental generation.
Findings
Existence of propagating solitary waves with conserved momentum.
Crossover from spin-wave states to Skyrmion-antiSkyrmion pairs.
Potential methods for experimental observation.
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.
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