Bell solitons in ultra-cold atomic Fermi gas

Date
2013
Authors
Khan, A.
Panigrahi P.K.
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Co-Advisor
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Source Title
Journal of Physics B: Atomic, Molecular and Optical Physics
Print ISSN
0953-4075
Electronic ISSN
Publisher
Volume
46
Issue
11
Pages
Language
English
Type
Article
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Abstract

We demonstrate the existence of supersonic bell solitons in the Bardeen-Cooper-Schrieffer-Bose-Einstein condensate crossover regime. Starting from the extended Thomas-Fermi density functional theory of superfluid order parameter, a density transformation is used to map the hydrodynamic mean field equation to a Lienard-type equation. As a result, bell solitons are obtained as exact solutions, which is further verified by the numerical solution of the dynamical equation. The stability of the soliton is established and its behaviour in the entire crossover domain is obtained. It is found that, akin to the case of vortices, bell solitons yield highest contrast in the BEC regime. © 2013 IOP Publishing Ltd.

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Keywords
Crossover regime, Dynamical equation, Exact solution, Mean field equation, Numerical solution, Superfluid order parameter, Thomas-Fermi, Ultra-cold, Bells, Density functional theory, Electron gas, Fermions, Statistical mechanics, Solitons
Citation
Published Version (Please cite this version)