  We demonstrate the modification of coherent zone-folded longitudinal acoustic
phonons (ZFLAPs) oscillations in InGaN/GaN multiple quantum wells by the
inclusion of metal nanoparticles (Au and Ag) via self-assembled inverted
hexagonal pits. Blueshift and redshift have been observed in photoluminescence
spectra due to the effect of electrostatic charge of metal nanoparticles (NPs).
A change in periodicity of ZFLAPs oscillations were demonstrated due to the
metal NPs inserted in the material system.
