Shape oscillations in nondegenerate Bose gases: Transition from the collisionless to the hydrodynamic regime
- FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam (Netherlands) and Van der Waals-Zeeman Institute of the University of Amsterdam, Valckenierstraat 65/67, 1018 XE (Netherlands)
- Institut fuer Theoretische Physik III Universitaet Stuttgart, Pfaffenwaldring 57 V, 70550 Stuttgart (Germany)
We investigate collective oscillations of nondegenerate clouds of {sup 87}Rb atoms as a function of density in an elongated magnetic trap. For the low-lying M=0 monopole-quadrupole shape oscillation we measure 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 crossover from the collisionless to the hydrodynamic regime. The experimental results show good agreement with theory. We also analyze 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.
- OSTI ID:
- 20718782
- Journal Information:
- Physical Review. A, Vol. 72, Issue 4; Other Information: DOI: 10.1103/PhysRevA.72.043610; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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