Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 26: Poster III
A 26.69: Poster
Donnerstag, 17. März 2011, 16:00–18:30, P2
Immersing Single Atoms into Cold and Ultracold Gases — •Farina Kindermann1, Shincy John1, Nicolas Spethmann1, Amir Moqanaki1, Claudia Weber1, Dieter Meschede1, and Artur Widera2,1 — 1Institut 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.
From a UHV-MOT Rb is loaded into a magnetic trap. In this trap, the Rb ensemble is precooled by microwave evaporation to approximately 1µ K. Using a magnetic transport guided by a dipole trap, the Rb is moved to the center of the quadrupole coils and loaded into a crossed dipole trap. In this crossed dipole trap, further evaporation to quantum degeneracy is performed. Using rf and microwave fields, the Rb is prepared in the magnetic insensitive F=0, mF=0 state. This enables the use of a high gradient MOT to capture single Cs atoms from the background gas. The overlap between both systems can be adjusted by optimizing the interaction between Cs atoms in the MOT and Rb atoms in the dipole trap. From the MOT, single Cs atoms are loaded into an one-dimensional lattice. Finally, the groundstate collisions between single Cs atoms and Rb gas can be studied in the conserative potential formed by the combination of the lattice and the dipole trap.