Condensation of classical nonlinear waves in a two-component system

Salman, Hayder and Berloff, Natalia G. (2009) Condensation of classical nonlinear waves in a two-component system. Physica D: Nonlinear Phenomena, 238 (15). pp. 1482-1489.

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We study the formation of large-scale coherent structures (condensates) for a system of two weakly interacting Bose gases in the semiclassical approximation. Using the coupled defocusing nonlinear Schrödinger (NLS) equations as a representative model, we focus on condensation in the phase mixing regime. We employ weak turbulence theory to provide a complete thermodynamic description of the classical condensation process. We show that the temperature and the condensate mass fractions are fully determined by the total number of particles in each component and the initial total energy. Moreover, we find that, at higher energies, condensation can occur in only one component. We derive an analytic result for the variation of the critical energy where this transition occurs. The theory presented provides excellent agreement with results of numerical simulations obtained by directly integrating the dynamical model.

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
Depositing User: Vishal Gautam
Date Deposited: 18 Mar 2011 14:22
Last Modified: 09 Feb 2023 13:35
DOI: 10.1016/j.physd.2009.01.003

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