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We consider a two-dimensional self-bound quantum droplet, which consists of amixture of two Bose-Einstein condensates. We start with the ground state, andthen turn to the rotational response of this system, in the presence of anexternal (harmonic) potential. We identify various phases, depending on theatom number, the strength of the external confinement and the angular momentum.These include center of mass excitation, ghost vortices, as well as vortices ofsingle and multiple quantization. According to our results, this is anexcellent system for the study of superfluid states.

Ground state and rotational properties of two-dimensional self-bound quantum droplets