Fig. 2: Femtosecond-laser-driven spectral and temporal evolution of PdSe2.
From: Phonon-assisted electronic states modulation of few-layer PdSe2 at terahertz frequencies
a 2D transient absorption map as a function of probe photon energy and pump-probe time delay. b Transient ΔT/T spectra of PdSe2 sample at different pump-probe time delays. c Extracted exciton energy shift (ΔE) as a function of pump-probe time delay. d Schematic of the electronic band structure at weak and strong screening regimes. The overall ΔE results from an interplay between the quasiparticle bandgap (Eg) shrinkage and the exciton binding energy (Eb) reduction due to the presence of photoexcited carriers.
