Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 23: Poster II

A 23.45: Poster

Thursday, March 11, 2010, 16:30–19:00, Lichthof

Probing an Ultracold Rb Cloud Stored in a Dipole Trap with Few and Single Atoms — •Oskar Fetsch, Wolfgang Alt, Shincy John, Amir Moqanaki, Nicolas Spethmann, Claudia Weber, Artur Widera, and Dieter Meschede — Institut für Angewandte Physik, 53115 Bonn, Deutschland

In this experiment, we aim on combining the advantages of single atom experiments with experiments dealing with ultracold quantum gases. Single and few Cs atoms are captured in a high-gradient magneto-optical trap (MOT) and the loading dynamics are observed through fluorescence detection. A Rb ensemble is cooled in a magnetic trap and then transferred using magnetic transport to a crossed dipole trap at the position of the Cs MOT. In this purely optical trap the Rb can be further cooled to quantum degeneracy. By transferring the Rb to a magnetic field insensitive state, it is possible to switch on the single atom MOT without affecting the Rb cloud. First experiments use few and single atoms trapped in a MOT to probe the ultracold Rb cloud. For further experiments, the internal spin degree of freedom of the Cs atoms needs to be manipulated. To accomplish this a species-selective optical lattice to trap the Cs atoms is set up.