Dresden 2011 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Ultra-cold atoms, ions and BEC II (with Q)

A 10.4: Vortrag

Dienstag, 15. März 2011, 11:15–11:30, BAR 106

Single Cs Atoms Interacting with an Ultracold Rb Gas — •Nicolas Spethmann1, Shincy John1, Farina Kindermann1, Amir Moqanaki1, Claudia Weber1, Dieter Meschede1, and Artur Widera2,11Institut für Angewandte Physik, Wegelerstr. 8, 53115 Bonn — 2Technische Universität Kaiserslautern, Fachbereich Physik, Erwin-Schrödinger-Str., 67663 Kaiserslautern

We immerse single Cs atoms into a many body systems consisting of cold and ultracold Rb gases in order to use the single Cs atom as a sensitive probe for inter-species interaction and as an agent to manipulate the quantum gas.

In order to study ground state collisions between a single Cs atom and a quantum degenerate Rb gas we have developed techniques to combine a quantum gas with a single trapped neutral atom. For this purpose, an optically trapped Rb BEC is prepared in the magnetic field insensitive F=1, mF=0 state. Then single Cs atoms are loaded into a superimposed 1D-lattice, which exerts a strong potential for Cs atoms and a weak potential for Rb. At ultralow temperatures and with negligible scattering of photons, ground state collions between the single atom and the quantum gas determine the interaction. This enables (coherent) probing and manipulation of the BEC by the single atom. We will report on the ground state interactions between single Cs atoms and a quantum gas and our recent progress controlling the single atom inside the quantum gas.

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