Researchers in QMC, in collaboration with researchers from Brookhaven National Lab, Max Plank Institute, and JQI, demonstrated a strong nonlinear optical response in atomically thin semiconducting WSe₂. They showed that a small number of photons was enough to change the material's optical absorption. The nonlinearity features a pronounced asymmetry between electron and hole doping, highlighting the importance of exciton-free charge interactions. This nonlinear response and mechanism open new avenues for applications in classical and quantum optoelectronics. (read more)