Ultrafast spectroscopy of propagating coherent acoustic phonons in GaN/InGaN heterostructures

Rongliang Liu, Chang Sub Kim, G. D. Sanders +6

We show that large amplitude, coherent acoustic phonon wavepackets can be generated and detected in In${}_x$Ga${}_{1-x}$N/GaN epilayers and heterostructures in femtosecond pump-probe d…