Frequencies and Damping rates of a 2D Deformed Trapped Bose gas above the Critical Temperature

Details Frequencies and Damping rates of a 2D Deformed Trapped Bose gas above the Critical Temperature Frequencies and Damping rates of a 2D Deformed Trapped Bose gas above the Critical Temperature

2000-07-12

arxiv.org/abs/cond-mat/0007210v2

Phys. Rev. A, Vol.63, p.013603 (2001)

Physics

Condensed Matter

13 pages, latex file

Scientific paper

10.1103/PhysRevA.63.013603

We derive the equation of motion for the velocity fluctuations of a 2D deformed trapped Bose gas above the critical temperature in the hydrodynamical regime. From this equation, we calculate the eigenfrequencies for a few low-lying excitation modes. Using the method of averages, we derive a dispersion relation in a deformed trap that interpolates between the collisionless and hydrodynamic regimes. We make use of this dispersion relation to calculate the frequencies and the damping rates for monopole and quadrupole mode in both the regimes. We also discuss the time evolution of the wave packet width of a Bose gas in a time dependent as well as time independent trap.

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