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We present photoluminescence measurements in monolayer WSe$_2$, which pointto the importance of the interaction between charged particles and excitoniccomplexes. The theoretical analysis highlights the key role played by exchangescattering, referring to cases wherein the particle composition of the complexchanges after the interaction. For example, exchange scattering renders brightexcitonic complexes dark in monolayer WSe$_2$ on accounts of the uniquevalley-spin configuration in this material. In addition to the ultrafast energyrelaxation of hot excitonic complexes following their interaction withelectrons or holes, our analysis sheds light on several key features that arecommonly seen in the photoluminescence of this monolayer semiconductor. Inparticular, we can understand why the photoluminescence intensity of theneutral bright exciton is strongest when the monolayer is hole-doped ratherthan charge neutral or electron-doped. Or the reason for the dramatic increaseof the photoluminescence intensity of negatively-charged excitons (trions) assoon as electrons are added to the monolayer. To self-consistently explain thefindings, we further study the photoluminescence spectra at differentexcitation energies and analyze the behavior of the elusive indirect exciton.

physical review. b./physical review. b

Relaxation and darkening of excitonic complexes in  electrostatically-doped monolayer semiconductors: Roles of exciton-electron  and trion-electron interactions