Monte Carlo Wave Function Simulation of High T_c Superfluorescence in Perovskites

Lead halide perovskites have been shown to exhibit superfluorescence (SF) even at unusually high temperatures. Traditionally observed under cryogenic conditions, SF requires long dephasing times for optically excited dipoles to produce short, intense bursts of radiation. We investigate the role of polaronic interactions in suppressing dephasing caused by thermal phonons, thereby preserving quantum coherence. To do so, we simulate the time evolution of exciton polarization and the resulting photoluminescence using the Monte Carlo Wave Function method. Our theoretical study reveals that collective coupling to certain optical phonon modes in lead halide perovskites drives the synchronization of optically excited dipoles, resulting in collective emission. In contrast, the absence of strong exciton-lattice coupling leads to incoherent photoluminescence. Our study replicates experimentally observed features of SF in perovskites.