Fig. 1: Lattice of coupled polariton condensates.
From: Machine learning of phase transitions in nonlinear polariton lattices
a Sketch of a square-arranged polariton lattice based on coupled micropillars. J denotes the tunnelling between sites and W corresponds to the gain coming from the incoherent pump. b, c State space flow diagrams showing the evolution of the single condensate for several different initial conditions (here ϕ and θ are polar and azimuthal angles that parametrise pseudospin direction). We reveal the change from a single dominant fixed point attractor sz = 0 into two attractors of broken symmetry between spin-up and spin-down polaritons sz ≠ 0.
