Energetically stable singular vortex cores in an atomic spin-1 Bose-Einstein condensate

Lovegrove, Justin and Borgh, Magnus O. and Ruostekoski, Janne (2012) Energetically stable singular vortex cores in an atomic spin-1 Bose-Einstein condensate. Physical review a, 86 (1). ISSN 1050-2947

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Abstract

We analyze the structure and stability of singular singly quantized vortices in a rotating spin-1 Bose-Einstein condensate. We show that the singular vortex can be energetically stable in both the ferromagnetic and polar phases despite the existence of a lower-energy nonsingular coreless vortex in the ferromagnetic phase. The spin-1 system exhibits energetic hierarchy of length scales resulting from different interaction strengths and we find that the vortex cores deform to a larger size determined by the characteristic length scale of the spin-dependent interaction. We show that in the ferromagnetic phase the resulting stable core structure, despite apparent complexity, can be identified as a single polar core with everywhere nonvanishing axially symmetric density profile. In the polar phase, the energetically favored core deformation leads to a splitting of a singly quantized vortex into a pair of half-quantum vortices that preserves the topology of the vortex outside the extended core region, but breaks the axial symmetry of the core. The resulting half-quantum vortices exhibit nonvanishing ferromagnetic cores.

Item Type:
Journal Article
Journal or Publication Title:
Physical review a
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
ID Code:
123713
Deposited By:
Deposited On:
23 Feb 2018 11:16
Refereed?:
Yes
Published?:
Published
Last Modified:
04 Jun 2020 04:54