Hannover 2010 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Poster I

A 8.21: Poster

Dienstag, 9. März 2010, 16:30–19:00, Lichthof

State dependent optical lattice and coherent motional state control of single neutral atoms — Leonid Förster, Michał Karski, Jai-Min Choi, Andreas Steffen, Noomen Belmechri, •Arif Mawardi, Kohei Katayama, Wolfgang Alt, Dieter Meschede, and Artur Widera — Institut für Angewandte Physik der Universität, Wegelerstr. 8, 53115 Bonn, Germany

In our experiment we trap neutral cesium atoms in a state dependent 1D-optical lattice. Along the tight axial-confinement, the atoms can be controllably shifted to the left or to the right depending on their hyperfine state. We use this ability for coherent manipulation of the quantized motional states using microwave radiation. We experimentally show that by adjusting the wavefunction overlap, microwaves can induce sideband transitions between any two trapped motional states. Based on this we have implemented a microwave cooling scheme which we used to achieve a ground state population of 97% along the axial degree of freedom.

Beyond single-particle effects this experiment aims on the realization of controlled coherent collisions between atoms. For this, 3D ground state population is crucial. Cooling schemes so far are limited by the weak radial confinement provided by the Gaussian profile of the trapping laser. We discuss how this limit can be bypassed by an additional blue detuned ring shaped laser beam overlapped with the original lattice and we present our preliminary progress.