Coherent merging of counterpropagating exciton-polariton superfluids
Boulier, T. and Pigeon, S. and Cancellieri, E. and Robin, P. and Giacobino, E. and Glorieux, Q. and Bramati, A.

Phys. Rev. B 98, 024503 (2018)

Phys. Rev. B 98, 024503  (2018)

We report the formation of a macroscopic coherent state emerging from colliding polariton fluids. Four lasers with random relative phases, arranged in a square, pump resonantly a planar microcavity, creating four coherent polariton fluids propagating toward each other. When the density (interactions) increases, the four fluids synchronize and the topological excitations (vortex or soliton) disappear to form a single quantum superfluid.