Fig. 5: Simulated CPFB generation via MD simulations.
From: Coherent phonon flatband generated in GaAs/AlAs superlattices via layer-selective optical pumping
a A schematic drawing of the m40/m90 Argon SL employed in MD simulations, with the layer-selective coherent displacement at time zero marked using yellow arrows in the m90 layer. Logarithmic SED maps of an m40/m90 SL under different excitation conditions: b No excitation, (c) Coherent displacive excitation by dT/T = 0.1 across all m90 layers. d Uniform temperature increases of dT/T = 0.1 across all m90 layers. e Coherent excitation in pure m90. The red circle marks the phonon mode coherently excited at time zero in (b). Red dashed lines depict the phonon dispersions of corresponding m40/m90 SL obtained from the lattice dynamics calculation.
