Exciton-polariton stimulated scattering in hybrid halide perovskites
Abstract
Halide perovskites, such as methylammonium lead bromide (MAPbBr3), host tightly bound three-dimensional excitons which are robust at room temperature. Excellent optical properties of MAPbBr3 allow for designing of optical single-mode waveguides and cavities in the frequency range close to the excitonic transitions. Taken together, this turns MAPbBr3 into an excellent platform for probing exciton-polariton nonlinear phenomena at room temperature. Here we investigate ultrafast non-equilibrium dynamics of polaritons under pulsed fs non-resonant excitation. We demonstrate the presence of the stimulated acoustic phonon-assisted scattering regime above threshold pump fluence, characterized by the explosive growth of emission intensity, a redshift of the emission spectral maximum, spectral narrowing, and sub-picosecond emission dynamics. Our theoretical findings are well confirmed by the results of experimental measurements.
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