Evidence for phonon-plasmon interaction inby Raman spectroscopy
- 8 January 2007
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 75 (3), 035205
- https://doi.org/10.1103/physrevb.75.035205
Abstract
The interaction between carriers and polar phonons in is investigated using Raman spectroscopy. An irreversible broadening and redshift of the -like phonon mode, observed after annealing the layer to , is direct evidence of phonon-plasmon interaction in . Variable field Hall effect measurements reveal that the layer is electrically heterogeneous and has at least three conduction layers exhibiting a reduction in mobility after annealing, consistent with the phonon-plasmon coupled mode broadening. A comparison between simulated and experimental coupled mode line shapes indicates that the mobility changes measured for bulk or interface carriers is not large enough to account for the experimentally observed annealing-induced broadening of the LO-like mode. We speculate that the observed -like mode broadening is related to surface conduction carriers.
Keywords
This publication has 17 references indexed in Scilit:
- Multiphonon resonance Raman scattering inPhysical Review B, 2005
- Phonon lifetimes and phonon decay in InNApplied Physics Letters, 2005
- Raman scattering by the longitudinal optical phonon in InN: Wave-vector nonconserving mechanismsPhysical Review B, 2005
- phonon structure in degenerate InN semiconductor filmsPhysical Review B, 2005
- Resonant Raman spectroscopy on InNPhysica Status Solidi (a), 2005
- Investigation of multiple carrier effects in InN epilayers using variable magnetic field Hall measurementsJournal of Crystal Growth, 2004
- Overdamped excitations of the free electron gas in GaN layers studied by Raman spectroscopyPhysical Review B, 1998
- Thermal stability and desorption of Group III nitrides prepared by metal organic chemical vapor depositionJournal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 1996
- Plasmon Raman scattering and photoluminescence of heavily dopedn-type InP near the Γ-X crossoverPhysical Review B, 1996
- Lindhard Dielectric Function in the Relaxation-Time ApproximationPhysical Review B, 1970