| Ultracold quantum gases offer a unique playground to investigate intriguing phenomena in two-body, few-body and many-body physics. I will present a few examples from recent experiments in Innsbruck. I will first present precision measurements on collective modes in the BEC-BCS crossover in a Fermi gas of Li-6 atoms. These measurements confirm the equation of state predicted in quantum Monte-Carlo simulations and rule out simple BCS mean field theory. I will also speak about rubidium Feshbach molecules in an optical lattice and their conversion into "repulsively bound atom pairs". Finally, I will discuss experimental evidence obtained on Efimov quantum states in an ultracold gas of cesium atoms. The latter result is a first experimental step into few-body physics with cold atoms. |
|