Volume 49, Number 1, January I 2000
|Page(s)||8 - 13|
|Published online||01 September 2002|
Collective excitations of a Bose condensate in the Thomas-Fermi regime
INFM, European Laboratory for Non Linear Spectroscopy (LENS) and
Dipartimento di Fisica,
Università di Firenze Largo E. Fermi 2, I-50125 Firenze, Italy
2 INFM, Dipartimento di Fisica, Università di Trento - I-38050 Trento-Povo, Italy
3 INFM, Dipartimento di Scienze Fisiche, Università di Napoli “Federico II” Complesso Universitario di Monte S. Angelo - via Cintia, I-80126 Napoli, Italy
Accepted: 24 November 1999
Collective excitations have been observed in a 87Rb Bose condensate, confined in a magneto-static, elongated, harmonic trap. We have measured the frequency of two different modes with zero angular momentum along the symmetry axis of the trap. Both the frequencies are in good agreement with the values predicted by the hydrodynamic theory of superfluids holding in the Thomas-Fermi regime.
PACS: 03.75.Fi – Phase coherent atomic ensembles; quantum condensation phenomena / 32.80.Pj – Optical cooling of atoms; trapping / 47.35.+i – Hydrodynamic waves
© EDP Sciences, 2000
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