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Engineering vortex rings and systems for controlled studies of vortex interactions in Bose-Einstein condensates

Engineering vortex rings and systems for controlled studies of vortex interactions in Bose-Einstein condensates
Engineering vortex rings and systems for controlled studies of vortex interactions in Bose-Einstein condensates
We study controlled methods of preparing vortex configurations in atomic Bose-Einstein condensates and their use in the studies of fundamental vortex scattering, reconnection processes, and superfluid sound emission. We explore techniques of imprinting vortex rings by means of coherently driving internal atomic transitions with electromagnetic fields which exhibit singular phase profiles. In particular, we show that a vortex ring can be prepared by two focused co-propagating Gaussian laser beams. More complex vortex systems may also be imprinted by directly superposing simpler field configurations or by programming their phase profiles on optical holograms. We analyze specific examples of two merging vortex rings in a trapped two-species 87Rb gas. We calculate the radiated sound energy in the reconnection process and show that the vortex relaxation and the redistribution of sound energy can be controlled by the imprinting process. As another creation technique, we study engineering pairs of two-dimensional point vortices in the condensates using a 'light roadblock' in ultraslow light propagation. We show how this can be used to study vortex collisions in compressible superfluids and how these collisions result in energy dissipation via phonons and, sometimes, annihilation of vortex pairs.
1050-2947
063626-[14pp]
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Dutton, Zachary
570a81b4-63e2-4d57-8604-27e6d1af02e9
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Dutton, Zachary
570a81b4-63e2-4d57-8604-27e6d1af02e9

Ruostekoski, Janne and Dutton, Zachary (2005) Engineering vortex rings and systems for controlled studies of vortex interactions in Bose-Einstein condensates. Physical Review A, 72 (6), 063626-[14pp]. (doi:10.1103/PhysRevA.72.063626).

Record type: Article

Abstract

We study controlled methods of preparing vortex configurations in atomic Bose-Einstein condensates and their use in the studies of fundamental vortex scattering, reconnection processes, and superfluid sound emission. We explore techniques of imprinting vortex rings by means of coherently driving internal atomic transitions with electromagnetic fields which exhibit singular phase profiles. In particular, we show that a vortex ring can be prepared by two focused co-propagating Gaussian laser beams. More complex vortex systems may also be imprinted by directly superposing simpler field configurations or by programming their phase profiles on optical holograms. We analyze specific examples of two merging vortex rings in a trapped two-species 87Rb gas. We calculate the radiated sound energy in the reconnection process and show that the vortex relaxation and the redistribution of sound energy can be controlled by the imprinting process. As another creation technique, we study engineering pairs of two-dimensional point vortices in the condensates using a 'light roadblock' in ultraslow light propagation. We show how this can be used to study vortex collisions in compressible superfluids and how these collisions result in energy dissipation via phonons and, sometimes, annihilation of vortex pairs.

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Published date: 2005

Identifiers

Local EPrints ID: 29360
URI: http://eprints.soton.ac.uk/id/eprint/29360
ISSN: 1050-2947
PURE UUID: 8cbccf54-bc5e-4f69-9492-2f0665ec1c9b

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Date deposited: 11 May 2006
Last modified: 09 Nov 2021 07:44

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Author: Zachary Dutton

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