Hannover 2003 – wissenschaftliches Programm
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Q: Quantenoptik
Q 14: Quantengase 2
Q 14.8: Vortrag
Montag, 24. März 2003, 18:15–18:30, F303
Bose-Einstein condensation in a double well potential — •M. Kemmann, T.G. Tiecke, Ch. Buggle, I. Shvarchuck, W. von Klitzing, and J.T.M. Walraven — FOM Institute for Atomic and Molecular Physics (AMOLF), Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
We realized Bose-Einstein condensation (BEC) in a purely magnetic double well potential.
We create these potentials by overcompensating the offset field B 0 of a standard Ioffe-Pritchard (IP) trap to produce two field zeros on the trap axis. By further adding a rotating bias field perpendicular to the trap axis the configuration is transformed into a double time orbiting potential (double TOP) trap [1]. The separation of the two wells is variable as well as the trapping frequencies and aspect ratios. This allows to investigate weakly coupled condensates. It was found to be possible to switch back to a single harmonic trapping potential without destroying the condensates. This causes the condensates to collide with an energy that depends on the separation of the two TOPs, allowing to explore the high energy excitations of the condensates.
Another possibility is to change the radial confinement from a circularly symmetric to an ellipsoidal form. This can be used to drive vortices or shape oscillations of Bose-condensed clouds.
[1] N.R. Thomas, A.C. Wilson, and C.J. Foot, Phys. Rev. A 65, 063406 (2002).