Phonon-driven intra-exciton Rabi oscillations in CsPbBr₃ halide perovskites.

ABSTRACT: Coupling electromagnetic radiation with matter, e.g., by resonant light fields in external optical cavities, is highly promising for tailoring the optoelectronic properties of functional materials on the nanoscale. Here, we demonstrate that even internal fields induced by coherent lattice motions can be used to control the transient excitonic optical response in CsPbBr₃ halide perovskite crystals. Upon resonant photoexcitation, two-dimensional electronic spectroscopy reveals an excitonic peak structure oscillating persistently with a 100-fs period for up to ~2 ps which does not match the frequency of any phonon modes of the crystals. Only at later times, beyond 2 ps, two low-frequency phonons of the lead-bromide lattice dominate the dynamics. We rationalize these findings by an

SUBMITTER: Nguyen XT 

PROVIDER: S-EPMC9958027 | biostudies-literature | 2023 Feb

REPOSITORIES: biostudies-literature