Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics

MO 19.5: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

Producing deeply bound ultracold LiRb molecules using laser pulses near a Feshbach resonance — •Marko Gacesa^1,2, Subhas Ghosal^3,4, and Robin Côté⁴ — ¹Max Planck Institute for the Physics of Complex Systems, Dresden, Germany — ²Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, USA — ³Birla Institute of Technology & Science, Pilani - Hyderabad Campus, India — ⁴University of Connecticut, Storrs, CT, USA

Production of ultracold diatomic molecules in the lowest ro-vibrational states is often a first step in experimental investigations of many-body physics with cold atoms. We propose a novel scheme for forming deeply bound ultracold LiRb molecules in a two-color pump-dump photoassociation experiment performed near a magnetic Feshbach resonance. In the pump step, ultracold Li and Rb atoms are photoassociated into an excited electronic state and the formed wave packet freely propagates to shorter internuclear distances. After the optimal overlap with the ground state is reached the second laser pulse is used to dump the wave packet into deeply bound ro-vibrational levels of the electronic ground state and form deeply bound molecules. The formation rate can be significantly increased if the pump step is performed near a Feshbach resonance due to the strong coupling between the states. In addition, the dependence of the nodal structure of the total wave function on the magnetic field allows for enhanced control over the shape and propagation of the wave packet. The illustrated scheme is general and applicable to different systems.