Dynamical thermalization and vortex formation in stirred two-dimensional Bose-Einstein condensates

Wright, T. M., Ballagh, R. J., Bradley, A. S., Blakie, P. B. and Gardiner, C. W. (2008) Dynamical thermalization and vortex formation in stirred two-dimensional Bose-Einstein condensates. Physical Review A (Atomic, Molecular and Optical Physics), 78 6: 063601-1-063601-22. doi:10.1103/PhysRevA.78.063601

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Author Wright, T. M.
Ballagh, R. J.
Bradley, A. S.
Blakie, P. B.
Gardiner, C. W.
Title Dynamical thermalization and vortex formation in stirred two-dimensional Bose-Einstein condensates
Journal name Physical Review A (Atomic, Molecular and Optical Physics)   Check publisher's open access policy
ISSN 1050-2947
1094-1622
Publication date 2008-12-02
Sub-type Article (original research)
DOI 10.1103/PhysRevA.78.063601
Open Access Status File (Publisher version)
Volume 78
Issue 6
Start page 063601-1
End page 063601-22
Total pages 22
Place of publication College Park, MD, United States
Publisher American Physical Society
Collection year 2009
Language eng
Abstract We present a quantum-mechanical treatment of the mechanical stirring of Bose-Einstein condensates using classical field techniques. In our approach the condensate and excited modes are described using a Hamiltonian classical field method in which the atom number and (rotating frame) energy are strictly conserved. We simulate a T=0 quasi-two-dimensional condensate perturbed by a rotating anisotropic trapping potential. Vacuum fluctuations in the initial state provide an irreducible mechanism for breaking the initial symmetries of the condensate and seeding the subsequent dynamical instability. Highly turbulent motion develops and we quantify the emergence of a rotating thermal component that provides the dissipation necessary for the nucleation and motional damping of vortices in the condensate. Vortex lattice formation is not observed, rather the vortices assemble into a spatially disordered vortex liquid state. We discuss methods we have developed to identify the condensate in the presence of an irregular distribution of vortices, determine the thermodynamic parameters of the thermal component, and extract damping rates from the classical field trajectories.
Keyword Bose-Einstein condensation
Nucleation
Quantum theory
Thermodynamic properties
Vortices
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mathematics and Physics
 
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Created: Thu, 09 Apr 2009, 15:43:53 EST by Stephanie Golding on behalf of ARC Centre of Excellence for Quantum-Atom Optics