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RESEARCH PRODUCT
Excitonic effects in two-LO-phonon resonant Raman scattering.
Alberto García-cristóbalAndrés CantareroCarlos Trallero-ginersubject
Phonon scatteringCondensed matter physicsChemistryScatteringGeneral ChemistryInelastic scatteringCondensed Matter Physicssymbols.namesakeX-ray Raman scatteringMaterials ChemistrysymbolsCoherent anti-Stokes Raman spectroscopyScattering theoryAtomic physicsRaman spectroscopyRaman scatteringdescription
Abstract The role of electron-hole correlation in resonant Raman scattering by two LO-phonons is analyzed. A theoretical model including excitons belonging to the discrete and continuous spectra as virtual intermediate states in the Raman process and valid for incident energies below and above the gap is developed. For the exciton-phonon coupling the Frohlich Hamiltonian is considered. The most important contribution to the Raman scattering efficiency corresponds to the continuous→discrete→discrete exciton transition, followed by the discrete→discrete→discrete and the continuous→continuous→discrete ones. The model is tested for GaP, where the scattering efficiency data are available around the E 0 critical point, and both the absolute value and the profile of the scattering efficiency are reproduced without adjustable parameters.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1993-06-01 | Solid State Communications |