Collisions and expansion of an ultracold dilute Fermi gas

Details Collisions and expansion of an ultracold dilute Fermi gas Collisions and expansion of an ultracold dilute Fermi gas

2004-04-07

arxiv.org/abs/cond-mat/0404175v2

Physics

Condensed Matter

Statistical Mechanics

7 pages, 3 figures, revised after comments from referees and to include corrections

Scientific paper

10.1209/epl/i2004-10086-8

We discuss the effects of collisions on the expansion of a degenerate normal Fermi gas, following the sudden removal of the confining trap. Using a Boltzmann equation approach, we calculate the time dependence of the aspect ratio and the entropy increase of the expanding atomic cloud taking into account the collisional effects due to the deformation of the distribution function in momentum space. We find that in dilute gases the aspect ratio does not deviate significantly from the predictions of ballistic expansion. Conversely, if the trap is sufficiently elongated the thermal broadening of the density distribution due to the entropy increase can be sizeable, revealing that even at zero temperature collisions are effective in a Fermi gas.

Affiliated with

Also associated with

No associations

Rating

Collisions and expansion of an ultracold dilute Fermi gas 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 Collisions and expansion of an ultracold dilute Fermi gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Collisions and expansion of an ultracold dilute Fermi gas will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-243537