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Skyrmion-antiSkyrmion pairs in Ultracold Atomic Gases

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.

preprint2011arXivOpen access
H. M. PriceN. R. Cooper
cond-mat.quant-gas
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H. M. PriceN. R. Cooper

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