Interspecies interaction in a strongly imbalanced Bose-Bose mixture

In our experiment, we study and intend to manipulate the interaction between the two species viz. rubidium (Rb) and caesium (Cs) at ultracold temperatures. We propose to explore the world of many body physics and small particle physics by inserting a few Cs atoms into a Rb condensate. Our experimental set up consists of a double MOT system, with a magnetic trap in the QUIC configuration. The Rb atoms are cooled evaporatively using a species selective microwave frequency such that Cs remains unaffected due to a 2.4 Ghz difference in their hyperfine transitions, producing a Rb condensate with around 105 atoms.