Influence of crystal-potential fluctuations on Raman spectra of coupled plasmon-LO-phonon modes in disordered systems

Influence of crystal-potential fluctuations on Raman spectra of coupled plasmon-LO-phonon modes in disordered systems

Autor Pusep, Y. A. Google Scholar
Silva, MTO Google Scholar
Galzerani, J. C. Google Scholar
Moshegov, N. T. Google Scholar
Basmaji, P. Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Universidade de São Paulo (USP)
Russian Acad Sci
Resumo The effect of the structural disorder in the Raman scattering of the coupled plasmon-LO phonon modes was studied in doped AlxGa1-xAs alloys and in doped GaAs/AlAs superlattices. It was observed that the asymmetry in the Raman lines, caused by this effect, is opposite to that observed for the optical phonons. This fact is explained by the differences in the dispersion curves of the optical phonons and plasmons-a negative dispersion for the phonons and a positive one for the plasmons. the analysis of the Raman line shapes by means of a Gaussian spatial correlation function allowed us to obtain the localization lengths for the LO phonons and for the plasmons in the alloys and in the superlattices; the dispersions of the coupled plasmon-LO-phonon modes were studied and an evidence for a metal-dielectric transition occurring in superlattices when the lowest miniband is completely occupied was found. [S0163-1829(98)08239-3].
Idioma Inglês
Data de publicação 1998-10-15
Publicado em Physical Review B. College Pk: Amer Physical Soc, v. 58, n. 16, p. 10683-10686, 1998.
ISSN 1098-0121 (Sherpa/Romeo, fator de impacto)
Publicador Amer Physical Soc
Extensão 10683-10686
Fonte http://dx.doi.org/10.1103/PhysRevB.58.10683
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000076716500089
Endereço permanente http://repositorio.unifesp.br/handle/11600/25969

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