Physics – Condensed Matter
Scientific paper
2002-02-06
Physics
Condensed Matter
14 pages, 13 figures, revtex
Scientific paper
We present an improved many-body T-matrix theory for partially Bose-Einstein condensed atomic gases by treating the phase fluctuations exactly. The resulting mean-field theory is valid in arbitrary dimensions and able to describe the low-temperature crossover between three, two and one-dimensional Bose gases. When applied to a degenerate two-dimensional atomic hydrogen gas, we obtain a reduction of the three-body recombination rate which compares favorably with experiment. Supplementing the mean-field theory with a renormalization-group approach to treat the critical fluctuations, we also incorporate into the theory the Kosterlitz-Thouless transition that occurs in a homogeneous Bose gas in two dimensions. In particular, we calculate the critical conditions for the Kosterlitz-Thouless phase transition as a function of the microscopic parameters of the theory. The proposed theory is further applied to a trapped one-dimensional Bose gas, where we find good agreement with exact numerical results obtained by solving a nonlinear Langevin field equation.
Andersen Jens O.
Khawaja U. Al
Proukakis Nick P.
Stoof H. T. C.
No associations
LandOfFree
Low-dimensional Bose gases does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Low-dimensional Bose gases, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-dimensional Bose gases will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-631649