Quantum Mixtures of degenerate atoms are ideal platforms to study and simulate multi-component quantum many-body systems where the mutual interactions are crucial, relevant to diverse fields from condensed matter to astrophysics.
In our lab we produce dual species Bose-Einstein condensates of K and Rb with tunable interspecies interactions. This experimental setting allows the investigation of multi-component superfluidity, quantum magnetism, polaron impurities, miscible/immiscible phase transitions. Furthermore, by properly tuning the interparticle interactions, we access new regimes where quantum fluctuations give rise to the formation of exotic quantum states as self-bound liquid-like droplets, as recently observed in our group.
We also study trapped atom interferometry with single-species Bose-Einstein condensates in multiple momentum components generated by time-dependent optical lattices: in this setting we look for evidence of quantum correlations leading to enhancements of the interferometer sensitivity. Such observations are meant to provide insight on the photon output of quantum-cascade lasers frequency combs.