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

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dc.creatorLeduc, M.
dc.creatorLeonard, J.
dc.creatorSantos, F. Pereira dos
dc.creatorJahier, E.
dc.creatorSchwartz, S.
dc.creatorCohen-Tannoudji, C.
dc.date2002-08-13
dc.date.accessioned2026-07-07T02:46:50Z
dc.date.available2026-07-07T02:46:50Z
dc.descriptionThis 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.
dc.description6 pages, 5 figures, end a few files for Latex compiling
dc.identifierhttps://arxiv.org/abs/cond-mat/0208263
dc.identifierhttp://arxiv.org/abs/cond-mat/0208263
dc.identifierActa Phys. Polon. B33, 8, 2213 (2002)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/19781
dc.subjectCondensed Matter
dc.titleHydrodynamic modes in a trapped gas of metastable helium above the Bose-Einstein transition
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