Fig. 2: Ultrafast infrared nano-imaging of many-body carrier dynamics.
From: Nanoscale heterogeneity of ultrafast many-body carrier dynamics in triple cation perovskites
AFM topography (a) and the corresponding heterodyne near-field pump-probe signal amplitude AHPP(T) image (b) acquired with the pump-probe delay T of 2 ps. c Time evolution of AHPP(T) demonstrating the heterogeneity in ultrafast carrier formation and relaxation over hundreds of nanometers. d AHPP(T) decay profiles extracted at two locations based on the imaging in c. e AHPP(T) decay profiles on another sample at two different locations acquired by the continuous scanning of the pump-probe delay time. f Image of the average decay time constant τavg extracted from the biexponential fits to the imaging in panel c. g Correlation plot between AHPP(T = 2 ps) and τavg (dashed, linear fit).
