2001/11/23 by F. Chevy, V. Bretin, P. Rosenbusch +2 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevlett.88.250402
4 pages, 4 figures, submitted to PRL
arxiv created 2001/11/23 · arxiv updated 2009/11/30
We study experimentally the transverse monopole mode of an elongated rubidium condensate. Due to the scaling invariance of the non-linear Schrödinger (Gross-Pitaevski) equation, the oscillation is monochromatic and sinusoidal at short times, even under strong excitation. For ultra-low temperatures, the quality factor Q=ω0/γ0 can exceed 2000, where ω0 and γ0 are the mode angular frequency and damping rate. This value is much larger than any previously reported for other eigenmodes of a condensate. We also present the temperature variation of ω0 and γ0.