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Q: Quantenoptik

Q 17: Poster: Cooling and Trapping

Q 17.17: Poster

Wednesday, April 4, 2001, 12:30–15:00, AT2

Towards 1-D BEC and doping a 3-D BEC — •Margit Dornseifer, Daniel Frese, Torsten Herz, Victor Gomer, and Dieter Meschede — Institut für Angewandte Physik, Universität Bonn, Wegelerstrasse 8, D-53115 Bonn, Germany

We discuss the feasibility of experimental realization of one-dimensional quantum gases. A 3-D BEC can be split into several channels of 1-D gases by adiabatically switching on an optical lattice. In order to detect whether a 1-D BEC is reached we want to use absorption imaging. The density profile depends on whether the temperature is higher or lower than the critical value. Dependent on the number of the atoms it should be possible to observe a transition between Tonks gas and BEC [1].

Our second goal is to dope 3-D BEC of Rb trapped in an optical dipole trap with few Cs atoms. The technique of trapping single Cs atoms and observation of their dynamics is well developed in our lab. With sympathetic cooling the Cs atoms will become nearly as cold as the Rb BEC. There could be several effects to detect. E.g. the Cs atoms could condensate, too [2]. In this case we may be able to detect a Rb shell because the Cs atoms should push the Rb condensate in an outer region.

[1] D.S. Petrov, G.V. Shlyapnikov, J.T.M. Walraven, PRL 85, 3745 (2000)

[2] A. Montina, R. Mennella, E. Arimondo, Phys. Lett. A 261, 337 (1999)