Fig. 4: Lifetimes of the coherent phonon branches.
From: Coherent phonon flatband generated in GaAs/AlAs superlattices via layer-selective optical pumping
Time-dependent amplitudes of the coherent phonon branches obtained with SWFT for a coincidental, b anti-phase and c in-phase double-pump measurements at Q = 0.12 r.l.u. The time step was chosen as 25 ps with a window duration of 87.5 ps to maintain an adequate signal-to-noise ratio for the oscillation amplitudes. The time step is smaller than the window size to differentiate the amplitude evolutions of the three coherent phonon branches.
