Composite cores of monopoles and Alice rings in spin-2 Bose-Einstein condensates

Baio, Giuseppe ORCID: and Borgh, Magnus O. ORCID: (2024) Composite cores of monopoles and Alice rings in spin-2 Bose-Einstein condensates. Physical Review Research, 6 (2).

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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 reflects the order-parameter symmetry of a cyclic inner core, depending on the initial configuration.

Item Type: Article
Additional Information: ACKNOWLEDGMENTS: The authors acknowledge financial support from the Engineering and Physical Sciences Research Council, Grant No. EP/V03832X/1. The numerical results presented in this paper were carried out on the High Performance Computing Cluster supported by the Research and Specialist Computing Support service at the University of East Anglia.
Uncontrolled Keywords: cond-mat.soft,hep-th,quant-ph,physics and astronomy(all) ,/dk/atira/pure/subjectarea/asjc/3100
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
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Depositing User: LivePure Connector
Date Deposited: 18 Jan 2024 01:37
Last Modified: 15 Jul 2024 01:27
DOI: 10.48550/arXiv.2401.04103


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