Frankfurt 2006 – wissenschaftliches Programm
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A: Atomphysik
A 11: Ultrakalte Atomphysik III
A 11.3: Vortrag
Mittwoch, 15. März 2006, 11:10–11:25, H6
Hydrodynamic shape oscillations in non-degenerate Bose gases — •Christian Buggle1,2, Paolo Pedri3, Wolf von Klitzing1,4, and Johannes T.M. Walraven1 — 1FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098SJ Amsterdam and Van der Waals-Zeeman Institute, University of Amsterdam, Valckenierstraat 65-67, 1018XE Amsterdam, The Netherlands — 2Ecole Normale Supérieure, 24, rue Lhomond, 75231 Paris, France — 3Institut für Theoretische Physik III Universität Stuttgart, Pfaffenwaldring 57 V, 70550 Stuttgart, Germany and LPTMS Université Paris-Sud, bâtiment 100, Centre Scientifique d’Orsay, 91405 Orsay, France — 4IESL-FORTH, P.O. Box 1527, 711 10 Heraklion, Greece
We have investigated collective oscillations of non-degenerate clouds of 87Rb atoms as a function of density in an elongated magnetic trap. For the low-lying M=0 monopole-quadrupole shape oscillation we have measured the oscillation frequencies and damping rates. At the highest densities the mean-free-path is smaller than the axial dimension of the sample, which corresponds to collisionally hydrodynamic conditions. This allows us to cover the cross-over from the collisionless to the hydrodynamic regime. We present our experimental results, which show good agreement with theory. We also demonstrate a detailed analysis of the influence of trap anharmonicities on the oscillations in relation to observed temperature dependencies of the dipole and quadrupole oscillation frequencies. We present convenient expressions to quantify these effects.