Engineering the radiative dynamics of thermalized excitons with metal interfaces

Abstract As a platform for optoelectronic devices based on exciton dynamics, monolayer transition metal dichalcogenides (TMDCs) are often placed near interfaces or inside planar cavities. While the radiative properties of point dipoles at has been studied extensively, those excitons, which delocalized and exhibit temperature-dependent momentum distribution, lack thorough treatment. Here, we analyze emission excitons in TMDCs explore their dependence center-of-mass momentum, dipole orientation, temperature. Defining characteristic energy scale k B T c = ( ℏk ) 2 /2 m being wavevector mass), find that temperatures ≫ low densities where distribution can be characterized by Maxwell–Boltzmann statistics, modified rates (normalized to free space) behave similarly dipoles. This similarity behavior arises due broad nature components making up emission. On other hand, narrow < result significantly different as compared These differences further amplified considering with Bose Einstein high phase space densities, such condensate phase. We suppression enhancement relative case several orders magnitude. insights help optimize performance incorporate 2D semiconductors electrodes inform future studies dynamics temperatures. Additionally, these show nanoscale optical cavities viable pathway generating long-lifetime states TMDCs.