Trion-phonon interaction in atomically thin semiconductors

Optical and transport properties of doped monolayer semiconductors are dominated by trions, which three-particle compounds formed two electrons one hole or vice versa. In this work, we investigate the trion-phonon interaction on a microscopic footing apply our model to exemplary case molybdenum diselenide (MoSe2) monolayer. We determine trion series states their internal quantum structure solving Schr\"odinger equation. Transforming system into basis equations motion, including within second-order Born-Markov approximation, provides access dynamics. particular, propagation compute diffusion coefficient mobility. low density limit, find that trions propagate less efficiently than excitons due stronger coupling with phonons larger mass. For increasing densities, predict drastic enhancement caused build-up large pressure degenerate gas, is direct consequence fermionic character trions. Our work insights its impact behaviour in atomically thin semiconductors.