Explore the fascinating world of strongly interacting electron and hole fluid in atomically thin two-dimensional heterostructures through this Stanford Physics colloquium. Delve into the rich phase diagram of electron-hole fluid, including bosonic exciton fluid, fermionic trion fluid, electron-hole plasma, and various mixture phases. Discover how the combination of repulsive and attractive Coulomb interactions leads to novel correlated phenomena of multiparticle charge complexes. Learn about the power of optical spectroscopy in probing the phase diagram and transport of electrons, holes, and excitons in electron-hole fluid. Gain insights into cutting-edge research in condensed matter physics and nanotechnology presented by UC Berkeley physicist Feng Wang.