Exploring Dissipative Effects in Molecular Exciton-Polariton Transport

Exciton-polaritons are hybrid states formed from the interactions between states in excitonic systems and cavity modes, and these hybrid states have attributes that come from the constituent excitonic and photonic degrees of freedom (DOF). Recent experiments have shown that such exciton-polariton systems exhibit different transport properties compared to the bare excitonic system. Under certain regimes, an exciton-polariton system can propagate ballistically with speeds close to a fraction of the speed of light. Even in regimes where diffusive dynamics dominate, the predicted diffusion coefficients of exciton-polaritons are larger than the diffusion coefficients of the uncoupled excitons. In this work, we demonstrate how various dissipative effects, such as exciton-phonon coupling and cavity loss, impact the transport properties of exciton-polaritons. We show from our results that these dissipative effects, which have different impacts on the excitonic and photonic DOFs, renormalize the ballistic velocities and diffusion coefficients based on the strength of the dissipative mechanism.