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

Core structure and non-Abelian reconnection of defects in a biaxial nematic spin-2 Bose-Einstein condensate
Core structure and non-Abelian reconnection of defects in a biaxial nematic spin-2 Bose-Einstein condensate
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.
1-6
Borgh, Magnus O.
a3c181f8-0535-46cd-bb9a-6e930a81f86e
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Borgh, Magnus O.
a3c181f8-0535-46cd-bb9a-6e930a81f86e
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4

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 (275302), 1-6. (doi:10.1103/PhysRevLett.117.275302).

Record type: Article

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.

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More information

Submitted date: 15 July 2016
Accepted/In Press date: 29 November 2016
e-pub ahead of print date: 29 November 2016
Published date: 29 December 2016
Organisations: Applied Mathematics

Identifiers

Local EPrints ID: 404565
URI: https://eprints.soton.ac.uk/id/eprint/404565
PURE UUID: 615af85a-511b-4c2d-9830-b2f79590babb

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Date deposited: 12 Jan 2017 09:07
Last modified: 09 Jan 2018 17:37

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