Towards single atom aided probing of an ultracold quantum gas [Elektronische Ressource] / vorgelegt von Shincy John

Towards single atom aided probing of anultracold quantum gasDissertationzurErlangung des Doktorgrades (Dr. rer. nat.)derMathematisch-Naturwissenschaftlichen Fakult atderRheinischen Friedrich-Wilhelms-Universit at Bonnvorgelegt vonShincy JohnausKottayam (Indien)Bonn 2010Angefertigt mit Genehmigung der Mathematisch-Naturwissenschaftlichen Fakult atder Rheinischen Friedrich-Wilhelms-Universit at Bonn1. Gutachter: Prof. Dr. Dieter Meschede2.hter: Prof. Dr. Martin WeitzTag der Promotion: 22.02.2011Erscheinungsjahr: 2011Diese Dissertation ist auf dem Hochschulschriftenserver der ULB Bonnhttp://hss.ulb.uni-bonn.de/diss online elektronisch publiziert.AbstractIn this thesis, the interactions in an unbalanced Rubidium (Rb)-Caesium (Cs) mix-ture are studied, where the Cs atoms have been used as probes to study the in-terspecies interactions. The Rb atoms are trapped and stored in a conservativepotential, in an optical dipole trap and cooled to quantum degeneracy. The coherentmanipulation of the spin states is realized using a microwave and radio frequencyradiation to prepare the Rb atoms in the various Zeeman split hyper ne levels of theground state. Cs atoms are trapped in a MOT. An overlap of these two entities isobtained via a magnetic transport to study the interspecies interactions. The dy-namics of the Cs MOT is studied in the presence of a 600 nK thermal cloud of Rb,where a loss in the Cs atoms is observed. Rb remains una ected.