Shape oscillation of a rotating Bose-Einstein condensateS. Stock, V. Bretin, F. Chevy and J. Dalibard
Laboratoire Kastler Brossel - 24 rue Lhomond, F-75231 Paris Cedex 05, France
(Received 5 November 2003; accepted 5 January 2004)
We present a theoretical and experimental analysis of the transverse monopole mode of a fast rotating Bose-Einstein condensate. The condensate's rotation frequency is similar to the trapping frequency and the effective confinement is only ensured by a weak quartic potential. We show that the non-harmonic character of the potential has a clear influence on the mode frequency, thus making the monopole mode a precise tool for the investigation of the fast-rotation regime.
03.75.Kk - Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow.
32.80.Pj - Optical cooling of atoms; trapping.
© EDP Sciences 2004