Multiphonon Resonance Raman Scattering in InGaN

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In In{sub x}Ga{sub 1-x}N epitaxial films with 0.37 < x < 1 and free electron concentrations in the 10{sup 18} cm{sup -3} range, strong resonant Raman scattering of A{sub 1}(LO) phonon is observed for laser excitation in Raman scattering when excited above the direct band gaps. Examination of films with direct band gaps between 0.7 and 1.9 eV using laser energies from 1.9 to 2.7 eV shows that the resonance is broad, extending to up to 2 eV above the direct gap. Multiphonon Raman scattering with up to 5 LO phonons is also observed for excitation close to resonance in ... continued below

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Ager III, J.W.; Walukiewicz, W.; Shan, W.; Yu, K.M.; Li, S.X.; Haller, E.E. et al. June 28, 2005.

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In In{sub x}Ga{sub 1-x}N epitaxial films with 0.37 < x < 1 and free electron concentrations in the 10{sup 18} cm{sup -3} range, strong resonant Raman scattering of A{sub 1}(LO) phonon is observed for laser excitation in Raman scattering when excited above the direct band gaps. Examination of films with direct band gaps between 0.7 and 1.9 eV using laser energies from 1.9 to 2.7 eV shows that the resonance is broad, extending to up to 2 eV above the direct gap. Multiphonon Raman scattering with up to 5 LO phonons is also observed for excitation close to resonance in alloy samples; this is the highest number of phonon overtones ever observed for multiphonon scattering in a III-V compound under ambient conditions. Coupling of the electron plasmon to the LO phonon to form a longitudinal plasmon coupled mode of the type which is observed in the Raman spectra of n-GaN, appears not to occur in In{sub x}Ga{sub 1-x}N for x > 0.37.

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  • Journal Name: Physical Review, B: Condensed Matter; Journal Volume: 72; Related Information: Journal Publication Date: 2005

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  • Report No.: LBNL--57953
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 878533
  • Archival Resource Key: ark:/67531/metadc877374

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  • June 28, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Sept. 30, 2016, 2:29 p.m.

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Ager III, J.W.; Walukiewicz, W.; Shan, W.; Yu, K.M.; Li, S.X.; Haller, E.E. et al. Multiphonon Resonance Raman Scattering in InGaN, article, June 28, 2005; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc877374/: accessed August 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.