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Baio, Giuseppe 
ORCID: https://orcid.org/0000-0003-4271-6894 and Borgh, Magnus O. ORCID: https://orcid.org/0000-0003-4243-7051
(2024)
Composite cores of monopoles and Alice rings in spin-2 Bose-Einstein condensates.
Abstract
We show that energy relaxation causes a point defect in the uniaxial-nematic phase of a spin-2 Bose-Einstein condensate to deform into a spin-Alice ring that exhibits a composite core structure with distinct topology at short and long distances from the singular line. An outer biaxial-nematic core exhibits a spin half-quantum vortex structure with a uniaxial-nematic inner core. By numerical simulation we demonstrate a dynamical oscillation between the spin-Alice ring and a split-core hedgehog configuration via the appearance of ferromagnetic rings with associated vorticity inside an extended core region. We further show that a similar dynamics is exhibited by a spin-Alice ring surrounding a spin-vortex line resulting from the relaxation of a monopole situated on a spin-vortex line in the biaxial-nematic phase. In the cyclic phase similar states are shown instead to form extended phase-mixing cores containing rings with fractional mass circulation or cores whose spatial shape reflect the order-parameter symmetry of cyclic inner core, depending on the initial configuration
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | cond-mat.soft,hep-th,quant-ph |
| Faculty \ School: | Faculty of Science > School of Physics |
| UEA Research Groups: | Faculty of Science > Research Groups > Centre for Photonics and Quantum Science Faculty of Science > Research Groups > Quantum Fluids |
| Depositing User: | LivePure Connector |
| Date Deposited: | 18 Jan 2024 01:37 |
| Last Modified: | 18 Jan 2024 01:37 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/94199 |
| DOI: | 10.48550/arXiv.2401.04103 |
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