Sangeet Kumar was a FLEET PhD student working with Centre Associate Investigators Jesper Levinsen and Dmitry Efimkin at Monash University. Sangeet works on novel exciton-polariton systems, with his PhD project investigating the dynamics of excitons-polaritons in two-dimensional semiconductors, with a particular focus on interactions mediated by strong coupling to light. This work fitted in FLEET Research theme 2 Exciton superfluids.