Core structure and non-Abelian reconnection of defects in a biaxial nematic spin-2 Bose-Einstein condensate

Borgh, Magnus O. and Ruostekoski, Janne (2016) Core structure and non-Abelian reconnection of defects in a biaxial nematic spin-2 Bose-Einstein condensate. Physical review letters, 117. ISSN 1079-7114

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Abstract

We calculate the energetic structure of defect cores and propose controlled methods to imprint a nontrivially entangled vortex pair that undergoes non-Abelian vortex reconnection in a biaxial nematic spin-2 condensate. For a singular vortex, we find three superfluid cores in addition to depletion of the condensate density. These exhibit order parameter symmetries that are different from the discrete symmetry of the biaxial nematic phase, forming an interface between the defect and the bulk superfluid. We provide a detailed analysis of phase mixing in the resulting vortex cores and find an instability dependent upon the orientation of the order parameter. We further show that the spin-2 condensate is a promising system for observing spontaneous deformation of a point defect into an “Alice ring” that has so far avoided experimental detection.

Item Type: Journal Article
Journal or Publication Title: Physical review letters
Additional Information: © 2016 American Physical Society
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/3100
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 123640
Deposited By: ep_importer_pure
Deposited On: 26 Feb 2018 15:24
Refereed?: Yes
Published?: Published
Last Modified: 11 Dec 2019 05:33
URI: https://eprints.lancs.ac.uk/id/eprint/123640

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