Stability and internal structure of vortices in spin-1 Bose-Einstein condensates with conserved magnetization

Lovegrove, Justin and Borgh, Magnus and Ruostekoski, Janne (2016) Stability and internal structure of vortices in spin-1 Bose-Einstein condensates with conserved magnetization. Physical review a, 93 (3). ISSN 1050-2947

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Abstract

We demonstrate how conservation of longitudinal magnetization can have pronounced effects on both stability and structure of vortices in the atomic spin-1 Bose-Einstein condensate by providing a systematic characterization of nonsingular and singular vortex states. Constructing spinor wave functions for vortex states that continuously connect ferromagnetic and polar phases, we systematically derive analytic models for nonrotating cores of different singular vortices and for composite defect states with distinct small- and large-distance topology. We explain how the conservation law provides a stabilizing mechanism when the coreless vortex imprinted on the condensate relaxes in the polar regime of interatomic interactions. The resulting structure forms a composite defect: The inner ferromagnetic coreless vortex deforms toward an outer singly quantized polar vortex. We also numerically show how other even more complex hierarchies of vortex-core topologies may be stabilized. Moreover, we analyze the structure of the coreless vortex also in a ferromagnetic condensate and show how reducing magnetization leads to a displacement of the vortex from the trap center and eventually to the deformation and splitting of its core where a singular vortex becomes a lower-energy state. For the case of singular vortices, we find that the stability and the core structure are notably less influenced by the conservation of magnetization.

Item Type: Journal Article
Journal or Publication Title: Physical review a
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 123649
Deposited By: ep_importer_pure
Deposited On: 26 Feb 2018 14:52
Refereed?: Yes
Published?: Published
Last Modified: 13 Nov 2019 07:29
URI: https://eprints.lancs.ac.uk/id/eprint/123649

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