Fig. 4
Coherent oscillations after photoexcitation. a, b Open circles show a time evolution of the oscillatory component of the reflectivity change ΔR/R at 0.58 eV (a) and its Fourier transformation (b). The red solid lines show fitting curves. The error bars indicate the standard deviation. c Magnitude of the fitting functions (AOSC) (open circles) together with the original reflectivity spectrum polarized along the a axis (the black line). The error bars indicate the standard deviation of the least squares fit. Red solid line is guided for eyes. d A schematic of the coherent oscillations after photoexcitation
