arXiv 1102.03402011-02-02cond-mat.quant-gas

Skyrmion-antiSkyrmion pairs in Ultracold Atomic Gases

H. M. Price, N. R. Cooper

发表信息：: Phys. Rev. A 83, 061605(R) (2011)
DOI：: 10.1103/PhysRevA.83.061605

英文摘要：

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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