Abstract
Exact two-dimensional solutions are constructed for the pseudo-spin-1/2 Bose—Einstein condensates, which are described by the coupled nonlinear Gross—Pitaevskii equations where the intra- and inter-species coupling constants are assumed to be equal. The equations are decoupled by means of re-combinations of the nonlinear terms of the hyperfine states according to the spatial dimensions. The stationary solutions form various spin textures which are identified as skyrmion crystals. In a special case, a crystal of skyrmion—anti-skyrmion pairs is formed in the soliton limit.
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