Collisionless modes of a trapped Bose gas

Details Collisionless modes of a trapped Bose gas Collisionless modes of a trapped Bose gas

1998-07-03

arxiv.org/abs/cond-mat/9807051v1

Physics

Condensed Matter

Statistical Mechanics

6 pages of LaTeX and 1 postscript figure. Contribution to the meeting `New directions in atomic phycics' held in Cambridge thi

Scientific paper

We calculate the excitation frequencies of the m=0 monopole and m=2 quadrupole modes in the collisionless regime by solving a non-linear Schroedinger equation for the condensate, coupled to a collisionless Boltzmann equation for the quasiparticles. Since the dynamics of the noncondensate cloud is also taken into account, the theory satisfies the Kohn theorem. The spectrum turns out to be strongly temperature dependent and we compare our results with experiment.

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