Theoretical Study of Auger Recombination of Excitons in Monolayer Transition-metal Dichalcogenides

Excitons are the most prominent features of the optical properties of monolayer transition-metal dichalcogenides(TMDC). In view of optoelectronics it is very important to understand the decay mechanisms of the excitons of these materials. Auger recombination of excitons are regarded as one of the dominant decay processes. In this paper the Auger constant of recombination is computed based on the approach proposed by Kavoulakis and Baym. We obtain both temperature dependent (from type A, A’ processes) and temperature independent (from type B, B’ processes) contributions, and a numerical estimate of theoretical result yields the value of constant in the order of 10 −2 cm 2 s −1 , being consistent with existing experimental data. This implies that Auger decay processes severely limit the photoluminescence yield of TMDC-based optoelectronic devices.