Photo Luminescence and Radiative Carrier Losses in Monolayer Transition Metal Dichalcogenides

The carrier losses due to radiative recombination in monolayer transition metal dichalcogenides are studied using fully microscopic many-body models. The density- and temperature-dependent losses in various Mo- and W-based materials are shown to be dominated by Coulomb correlations beyond the Hartree–Fock level. Despite the much stronger Coulomb interaction in 2D materials, the radiative losses are comparable–if not weaker–than in conventional III–V materials. A strong dependence on the dielectric environment is found in agreement with experimental results.