2025/08/16 by Qi, W., Ponzoni, S., Huitric, G. +13
#FOS: Physical sciences #Other Condensed Matter (cond-mat.other)
paper · doi:10.48550/arxiv.2508.12129
Time- and Angle-Resolved Photoelectron Spectroscopy (tr-ARPES) is employed to monitor photoexcited electrons in the two-dimensional hybrid perovskite (BA)2(MA)2Pb3I10. Photoelectron intensity maps are in good agreement with ab-initio calculations of the band structure. The effective mass is -0.18 ± 0.02 me and 0.12 ± 0.02 me for holes and electrons, respectively. In the photoexcited state, spin-orbit splitting of the conduction band cannot be resolved. This sets the upper bound of photoinduced Rashba coupling to αC<2.5 eVÅ. The correlated electron-hole plasma evolves in Wannier excitons with Bohr radius of 2.5 nm, while no sign of self-trapping in small polarons is found within the investigated time window of up to 120 ps following photoexcitation.