Manipulation of ultracold atomic mixtures using microwave techniques
  We used microwave radiation to evaporatively cool a mixture of of 133Cs and 87Rb atoms in a magnetic trap. A mixture composed of an equal number (around 10^4) of Rb and Cs atoms in their doubly polarized states at ultracold temperatures was prepared. We also used microwaves to selectively evaporate atoms in different Zeeman states. 
D. Ciampini, E. Courtade, C. Sias, D. Cossart, G. Carelli, F. Mango,   O. Morsch and E. Arimondo