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1996
Conference Paper
Titel
Resonant multi-LO-phonon Raman scattering in hexagonal GaN
Alternative
Resonante Multi-LO-Phononen-Ramanstreuung in hexagonalem GaN
Abstract
We report on resonant Raman scattering in state-of-the-art hexagonal GaN. Besides multi-LO-phonon scattering up to fifth order, dispersive modes were observed which are interpreted as acoustic phonon interbranch exciton-polariton scattering followed by LO-phonon emission. Within this model the sound velocities of TA- and LA-phonon modes were determined propagating in the direction with the strongest piezoelectric coupling. A fit to the experimental data yields values of 6500m/s and 8400 m/s for the TA- and LA-phonon mode. respectively.