César Cabrera
Ultracold Quantum Gases group, ICFO
Quantum mixtures are versatile systems for the study of a broad range of phenomena, including both few- and many-body physics. During my talk, I will introduce a new experimental setup designed to produce ultracold Bose-Bose or Bose-Fermi mixtures of potassium isotopes. In particular, I will focus on our latest results: the production of a 41K Bose-Einstein condensate (BEC) by direct evaporative cooling, of a dual BEC of 39K and 41K by sympathetic cooling, and the very recent observation of the miscible-inmiscible quantum phase transition in the binary condensate mixture.
Due to the favorable Feshbach resonances of 39K, our system is an ideal candidate for the controlled study of this phase transition. It should also enable the study of polaron physics in the strongly interacting regime, and the emergence of interactions between atoms of one species mediated by the other one.