A Monte Carlo Formulation of the Bogolubov Theory

Details A Monte Carlo Formulation of the Bogolubov Theory A Monte Carlo Formulation of the Bogolubov Theory

2000-04-04

arxiv.org/abs/cond-mat/0004046v2

Journal of Modern Optics 47, 2629-2644 (2000).

Physics

Condensed Matter

Statistical Mechanics

17 pages, 1 figure, submitted to Journal of Modern Optics

Scientific paper

We propose an efficient stochastic method to implement numerically the Bogolubov approach to study finite-temperature Bose-Einstein condensates. Our method is based on the Wigner representation of the density matrix describing the non condensed modes and a Brownian motion simulation to sample the Wigner distribution at thermal equilibrium. Allowing to sample any density operator Gaussian in the field variables, our method is very general and it applies both to the Bogolubov and to the Hartree-Fock Bogolubov approach, in the equilibrium case as well as in the time-dependent case. We think that our method can be useful to study trapped Bose-Einstein condensates in two or three spatial dimensions without rotational symmetry properties, as in the case of condensates with vortices, where the traditional Bogolubov approach is difficult to implement numerically due to the need to diagonalize very big matrices.

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