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Article overview
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Hydrodynamic modes in a trapped gas of metastable helium above the Bose-Einstein transition | | M. Leduc
; J. Leonard
; F. Pereira dos Santos
; E. Jahier
; S. Schwartz
; C. Cohen-Tannoudji
; | | Date: |
13 Aug 2002 | | Journal: | Acta Phys. Polon. B33, 8, 2213 (2002) | | Subject: | cond-mat | | Abstract: | 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. | | Source: | arXiv, cond-mat/0208263 | | Services: | Forum | Review | PDF | Favorites | |
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