2009/09/04 by R. Meppelink, Meppelink, R., Sonja Koller +8
Physics and Astronomy · #Cold Atom Physics and Bose-Einstein Condensates #FOS: Physical sciences #Quantum Electrodynamics and Casimir Effect #Quantum Gases (cond-mat.quant-gas) #Strong Light-Matter Interactions #cond-mat.quant-gas
paper · pdf · doi:10.48550/arxiv.0909.0886
Submitted to Phys. Rev. Lett. with 5 figures
arxiv created 2009/09/04 · openalex publication_date 2009/09/04 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study the second sound dipole mode in a partially Bose-Einstein condensed gas. This mode is excited by spatially separating and releasing the center-of-mass of the Bose-Einstein condensate (BEC) with respect to the thermal cloud, after which the equilibration is observed. The oscillation frequency and the damping rate of this mode is studied for different harmonic confinements and temperatures. The measured damping rates close to the collisionless regime are found to be in good agreement with Landau damping. For increasing hydrodynamicity of the cloud we observe an increase of the damping.