Fig. 1. Time-resolved pump-probe spectroscopy showing the ultrafast dynamics of MoP: (a) The ∆R/R₀ of MoP at several typical temperatures from 7 to 290 K; (b) SEM image of our sample; (c) and (d) Schematic lattice structures of MoP. Blue and red balls: Mo and P atoms, respectively.

Fig. 2. 2D mapping diagram of temperature-dependent dynamics.

Fig. 3. Fitting of the ∆R/R₀ at 7 K, where the black circles represent the raw data and the blue curve represents the fitting result, respectively. The inset illustrates the temperature dependence of the frequency of the coherent acoustic phonon, which stays 0.033 THz for the whole temperature range.

Fig. 4. Temperature dependence of the amplitudes and lifetimes: (a)A_fast, (b)τ_fast, (c)A_fast和(d)τ_slow. The red and blue linesdenote the fast and slow components, respectively.