Topological interface physics of defects and textures in spinor Bose-Einstein condensates

Borgh, Magnus O. and Ruostekoski, Janne (2013) Topological interface physics of defects and textures in spinor Bose-Einstein condensates. Physical review a, 87 (3). ISSN 1050-2947

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Abstract

We provide a detailed description of our previously proposed scheme for topological interface engineering with constructed defects and textures perforating across coherent interfaces between different broken symmetries [M. O. Borgh and J. Ruostekoski, Phys. Rev. Lett. 109, 015302 (2012)]. We consider a spin-1 Bose-Einstein condensate, in which polar and ferromagnetic phases are prepared in spatially separated regions. We show that a stable coherent interface is established between the two phases, allowing defects of different topology to connect continuously across the boundary. We provide analytic constructions of interface-crossing defect solutions that could be experimentally phase-imprinted using existing technology. By numerically minimizing the energy, we calculate the core structures of interface-crossing defect configurations. We demonstrate nontrivial core deformations to considerably more complex structures, such as the formation of an arch-shaped half-quantum line defect, an Alice arch, at the interface, with the topological charge of a point defect, whose emergence may be understood by the "hairy ball" theorem. Another example of an energetically stable object is the connection of a coreless vortex to a pair of half-quantum vortices. We show that rotation leads to spontaneous nucleation of defects in which a coreless vortex continuously transforms to a half-quantum vortex across the interface

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: 123710
Deposited By: ep_importer_pure
Deposited On: 23 Feb 2018 11:30
Refereed?: Yes
Published?: Published
Last Modified: 11 Feb 2020 09:20
URI: https://eprints.lancs.ac.uk/id/eprint/123710

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