Justin Lovegrove, Magnus O. Borgh, Janne Ruostekoski
We show that conservation of longitudinal magnetization in a spinor condensate provides a stabilizing mechanism for a coreless vortex phase-imprinted on a polar condensate. The stable vortex forms a composite topological defect with distinct small- and large-distance topology: the inner ferromagnetic coreless vortex continuously deforms to an outer singular, singly quantized polar vortex. A similar mechanism can also stabilize a nonsingular nematic texture in the polar phase. A weak magnetization is shown to destabilize a coreless vortex in the ferromagnetic phase.
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http://arxiv.org/abs/1306.4700
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