Molecular exciton-polariton condensate lattice via structured illumination

Exciton-polaritons (EPs) form through strong light–matter coupling and combine a low effective mass with nonlinear interparticle interactions. Of particular interest are EP lattices, an exciting testbed for many-body physics and physical computation. Here we demonstrate an optically imprinted large-scale EP condensate lattice realized using an organic molecular system operating at room temperature. We demonstrate two ways to manipulate lattice coupling in real-time—changing spacing across the lattice and tailoring the pump power of individual sites—paving the way to various applications such as X Y Hamiltonian simulation and neuromorphic computing. We emphasize the inherent flexibility of our setup in the ability to operate entirely at room temperature, scalability, and the use of commercially available organic dyes, which opens the door to EP lattices across a wide spectral range.