We are a theoretical research group working on nonlinear photonics and quantum optics. Much of our research focuses on hybrid light-matter coupled systems such as exciton-polaritons in microcavities. We work closely with experimental groups in the description of fundamental effects in these systems, but are also interested in predicting new phenomena and deriving new applications from them.Excitons are bound hydrogen-like states of electrons and holes, typically appearing in semiconductor quantum wells. Their electric dipole moment allows them to couple to light, particularly in semiconductor microcavities, and if this coupling is strong enough it can lead to hybrid states of excitons and light known as exciton-polaritons. Being hybrid states, exciton-polaritons inherit a mix of electronic and optical properties, including strong nonlinearities, sensitivity to electric/magnetic fields, long coherence times, fast picosecond scale dynamics. Theoretically, excitons and exciton-polaritons are also interesting for their rich spin dynamics, which gives rise to the optical spin Hall effect, spin-to-orbital angular momentum conversion; and spinor vortex dynamics.