Fig. 4: Real-time observation of interlayer coherent vibrational dynamics of PdSe2.
From: Phonon-assisted electronic states modulation of few-layer PdSe2 at terahertz frequencies
a 3D transient absorption spectrum in terms of differential transmission ΔT/T as a function of time delay and probe photon energy on a picosecond timescale. b Time-dependent ΔT/T with different probe photon energies. c Coherent phonon dynamics at 0.35 THz probed at photon energies of 2.58, 2.14, and 1.94 eV. The vibrational traces are fitted using an exponentially damped sinusoid model. d Fast decay time τ1 and exciton lifetime τ2 as a function of probe photon energy. The best-fit value is fitted using a bi-exponential decay model with a criterion of the minimum standard deviation of the residuals.
