Recombination of excitons trapped in defect potentials of 2D TMDCs (like MoS₂, WSe₂) gives rise to deterministic single photon emission for quantum information processing. 

With small-angle twisting, flat bands amplify electron correlations. Periodic moiré potentials trap interlayer excitons across high-symmetry atomic registries. 

Harnessing the helicity of circularly polarized light to initialize and read out valley pseudospins in monolayer semiconductors protected by time-reversal symmetry.