The University of Southampton
University of Southampton Institutional Repository

Internal structure and stability of vortices in a dipolar spinor Bose-Einstein condensate

Internal structure and stability of vortices in a dipolar spinor Bose-Einstein condensate
Internal structure and stability of vortices in a dipolar spinor Bose-Einstein condensate
We demonstrate how dipolar interactions can have pronounced effects on the structure of vortices in atomic spinor Bose-Einstein condensates and illustrate generic physical principles that apply across dipolar spinor systems. We then find and analyze the cores of singular vortices with non-Abelian charges in the point-group symmetry of a spin-3 $^{52}$Cr condensate. Using a simpler model system, we analyze the underlying dipolar physics and show how a characteristic length scale arising from the magnetic dipolar coupling interacts with the hierarchy of healing lengths of the s-wave scattering, and leads to simple criteria for the core structure: When the interactions both energetically favor the ground-state spin condition, such as in the spin-1 ferromagnetic phase, the size of singular vortices is restricted to the shorter spin-dependent healing length. Conversely, when the interactions compete (e.g., in the spin-1 polar phase), we find that the core of a singular vortex is enlarged by increasing dipolar coupling. We further demonstrate how the spin-alignment arising from the interaction anisotropy is manifest in the appearance of a ground-state spin-vortex line that is oriented perpendicularly to the condensate axis of rotation, as well as in potentially observable internal core spin textures. We also explain how it leads to interaction-dependent angular momentum in nonsingular vortices as a result of competition with rotation-induced spin ordering. When the anisotropy is modified by a strong magnetic field, we show how it gives rise to a symmetry-breaking deformation of a vortex core into a spin-domain wall.
cond-mat.quant-gas
1050-2947
Borgh, Magnus O.
a3c181f8-0535-46cd-bb9a-6e930a81f86e
Lovegrove, Justin
6a6c01a6-cfcb-462d-ab19-ac29cd8d7e40
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Borgh, Magnus O.
a3c181f8-0535-46cd-bb9a-6e930a81f86e
Lovegrove, Justin
6a6c01a6-cfcb-462d-ab19-ac29cd8d7e40
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4

Borgh, Magnus O., Lovegrove, Justin and Ruostekoski, Janne (2017) Internal structure and stability of vortices in a dipolar spinor Bose-Einstein condensate. Physical Review A, 95. (doi:10.1103/PhysRevA.95.053601).

Record type: Article

Abstract

We demonstrate how dipolar interactions can have pronounced effects on the structure of vortices in atomic spinor Bose-Einstein condensates and illustrate generic physical principles that apply across dipolar spinor systems. We then find and analyze the cores of singular vortices with non-Abelian charges in the point-group symmetry of a spin-3 $^{52}$Cr condensate. Using a simpler model system, we analyze the underlying dipolar physics and show how a characteristic length scale arising from the magnetic dipolar coupling interacts with the hierarchy of healing lengths of the s-wave scattering, and leads to simple criteria for the core structure: When the interactions both energetically favor the ground-state spin condition, such as in the spin-1 ferromagnetic phase, the size of singular vortices is restricted to the shorter spin-dependent healing length. Conversely, when the interactions compete (e.g., in the spin-1 polar phase), we find that the core of a singular vortex is enlarged by increasing dipolar coupling. We further demonstrate how the spin-alignment arising from the interaction anisotropy is manifest in the appearance of a ground-state spin-vortex line that is oriented perpendicularly to the condensate axis of rotation, as well as in potentially observable internal core spin textures. We also explain how it leads to interaction-dependent angular momentum in nonsingular vortices as a result of competition with rotation-induced spin ordering. When the anisotropy is modified by a strong magnetic field, we show how it gives rise to a symmetry-breaking deformation of a vortex core into a spin-domain wall.

Text
dipolar-structure-pra-final - Accepted Manuscript
Download (1MB)

More information

Submitted date: 31 January 2017
Accepted/In Press date: 6 April 2017
e-pub ahead of print date: 1 May 2017
Keywords: cond-mat.quant-gas
Organisations: Mathematical Sciences, Applied Mathematics

Identifiers

Local EPrints ID: 407674
URI: https://eprints.soton.ac.uk/id/eprint/407674
ISSN: 1050-2947
PURE UUID: cee15917-91dc-4227-b0d4-d76b1e619305

Catalogue record

Date deposited: 22 Apr 2017 01:03
Last modified: 13 Mar 2019 20:03

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×