Dynamics of a Trapped Bose-Condensed Gas at Finite Temperatures (熱場の量子論とその応用)

徹郎 二国

正人 大矢

Wojciech Gawlik, W. Jastrzȩbski, J. Szczepkowski +3 more

This paper presents the results of our recent experiments on the finite-temperature Bose?Einstein condensate of 87Rb atoms in a magnetic trap, and is devoted to the study of the hydrodynamic properties and dynamics of an ultra-cold atomic gas near the critical temperature. Measurements of the aspect ratio of an expanding atomic cloud allow for verification of the condensate models and study of the interaction between condensed and non-condensed fractions of a finite-temperature sample.

Avy Soffer, Minh-Binh Tran

Hongwei Xiong, Shujuan Liu, Guoxiang Huang +2 more

The critical temperature and condensate fraction of a trapped interacting Bose gas are investigated when both atom-atom interaction and finite-size effects are taken into account. A canonical ensemble is used to obtain the equations on the condensate fraction for the trapped interacting Bose gas near and below the critical temperature. In our approaches corrections due to atom-atom interaction and finite-size effects are obtained simultaneously for the critical temperature and condensate fraction of the system. An analytical high-order correction to the condensate fraction is given.

E. Zaremba, Tetsuro Nikuni, Adam Griffin