Experiments with Ultracold Atomic and Molecular Quantum Gases
Prof. Hanns-Christoph Nägerl (Universität Innsbruck)

In this talk I will present three of our recent, very different results with ultracold atomic and molecular quantum gases. First, I will report on the observation of scattering resonances in ultracold atom-dimer scattering. We observe two novel types of resonances, one which we associate to weakly-bound Efimov trimer states, and another one which we attribute to an exchange reaction. Second, I will give an overview over our experiments with quantum gases in optical lattices with tunable interactions. We observe and control many-body matter wave interference, i.e. interference that is driven by the nonlinear particle interactions. In one-dimensional geometry, we enter deeply into the Tonk-Girardeau regime where the system dynamics is given by fermionization of bosons. Third, regarding a very different quantum gas regime, I will report on the production of molecular quantum gases in the ro-vibrational ground state. We reach the rovibrational ground state by two subsequent steps of coherent two-photon transfer. I will finally outline our strategy for producing a Bose-Einstein condensate of (chemists') molecules.