FLEET PI Prof Grzegorz Sęk specialises in novel epitaxial nanostructures in nanophotonics, new semiconducting systems in optoelectronics and sensing, many-particle physics, dynamical properties and light-matter coupling in solids, exciton-polaritons and their condensation, and two-dimensional materials. At FLEET, Prof Sęk coordinated the Centre’s collaboration with the Laboratory for Optical Spectroscopy of Nanostructures (LOSN) at Wrocław University of Science and Technology (WUST), bringing in new expertise on optical spectroscopy and ultrafast dynamics, with a special focus on TMD crystals and monolayers as well as the exciton-polariton condensates.