Approximating steady states in equilibrium and non-equilibrium condensates

Salman, Hayder (2012) Approximating steady states in equilibrium and non-equilibrium condensates. Physical Review A (PRA), 85.

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We obtain approximations for the time-independent Gross-Pitaevskii (GP) and complex GP equation in two and three spatial dimensions by generalizing the divergence-free WKB method. The results include an explicit expression of a uniformly valid approximation for the condensate density of an ultracold Bose gas confined in a harmonic trap that extends into the classically forbidden region. This provides an accurate approximation of the condensate density that includes healing effects at leading order that are missing in the widely adopted Thomas-Fermi approximation. The results presented herein allow us to formulate useful approximations to a range of experimental systems including the equilibrium properties of a finite-temperature Bose gas and the steady-state properties of a two-dimensional nonequilibrium condensate. Comparisons between our asymptotic and numerical results for the conservative and forced-dissipative forms of the GP equations as applied to these systems show excellent agreement between the two sets of solutions, thereby illustrating the accuracy of these approximations.

Item Type: Article
Faculty \ School: Faculty of Science > School of Mathematics
UEA Research Groups: Faculty of Science > Research Groups > Quantum Fluids
Faculty of Science > Research Groups > Centre for Photonics and Quantum Science
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Depositing User: Hayder Salman
Date Deposited: 18 Apr 2013 14:15
Last Modified: 09 Feb 2023 13:33

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