title: Energetic stability of coreless vortices in spin-1 Bose-Einstein condensates with conserved magnetization.
abstract: 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 can form a composite topological defect with distinct small- and large-distance topology: the inner ferromagnetic coreless vortex continuously deforms toward 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.
authors.affiliation: Mathematical Sciences, University of Southampton, SO17 1BJ Southampton, United Kingdom.
authors.forename: Justin
authors.initials: J
authors.lastname: Lovegrove
authors.affiliation: Mathematical Sciences, University of Southampton, SO17 1BJ Southampton, United Kingdom.
authors.forename: Magnus O
authors.initials: MO
authors.lastname: Borgh
authors.affiliation: Mathematical Sciences, University of Southampton, SO17 1BJ Southampton, United Kingdom.
authors.forename: Janne
authors.initials: J
authors.lastname: Ruostekoski