Liquid quantum droplets in Bose-Bose mixtures

Atomic Bose-Einstein condensate is a gaseous ultradilute, ultracold system confined in space by external fields. Mixture of two such atomic condensates might lead, under certain conditions, to formation of an exotic quantum liquid taking form of a self-bound droplet - no external trap is needed to keep the atoms together. Binding energy of the droplet is provided by quantum fluctuations, the zero point energy of collective excitations of the system. In the first part of my talk I describe discovery of quantum droplets and explain a mechanism of their formation. In the second part, I will focus on a scattering of two droplets and interpret the scattering process in terms of double Josephson junction physics.

Link to lecture video