Polariton Superfluids

It is possible to engineer the properties of photons in an optical medium to have an effective mass and repulsive interactions, so that they act like a gas of atoms These “renormalized photons” are called polaritons In the past decade, several experiments have demonstrated many of the canonical effects of Bose Einstein condensation and superfluidity of polaritons In this talk I will review some of the physics of polaritons and present recent results with polaritons that have very long lifetime, including our recent results on persistent circulation of a polariton condensate.