Hydrodynamic modes in a trapped gas of metastable helium above the Bose-Einstein transition

Details Hydrodynamic modes in a trapped gas of metastable helium above the Bose-Einstein transition Hydrodynamic modes in a trapped gas of metastable helium above the Bose-Einstein transition

2002-08-13

arxiv.org/abs/cond-mat/0208263v1

Acta Phys. Polon. B33, 8, 2213 (2002)

Physics

Condensed Matter

6 pages, 5 figures, end a few files for Latex compiling

Scientific paper

This article describes experiments performed with an ultracold gas of metastable helium above the Bose-Einstein transition. The gas is trapped in an harmonic magnetic potential and collective excitations are induced. Both the frequency and the damping rate of the lowest monopole-quadrupole m = 0 mode of excitation are studied at different temperatures and compared to theoretical predictions. Results indicate that the gas goes from a collisionless regime towards a hydrodynamic regime as the elastic collision rate increases, when one goes down along the evaporative cooling ramp. However we find a discrepancy for the collisional parameters in comparison with predictions relying on the value of the scattering length previously estimated. Possible explanations are put forward in the final discussion.

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