Two-Body Interactions Between Li and Cs Atoms

In this chapter we investigate binary scattering properties of an ultracold mixture of Li and Cs atoms, on which the further exploration of few-body effects throughout the rest of this thesis is based. We start by briefly reiterating basic theoretical concepts of low-energy scattering. It is followed by a description of a typical experimental approach for producing an ultracold mixture of Li and Cs atomic gases. Finally, we present pioneering measurements of weakly bound LiCs Feshbach dimers and obtain LiCs singlet and triplet molecular potential curves with unprecedented accuracy with the help of a coupled-channels calculation. These results provide with currently the most complete knowledge of Li-Cs low-energy scattering properties and Feshbach resonances.