Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/5469
Título: | One-phonon Raman scattering from arrays of semiconductor nano-crystals |
Autor(es): | Vasilevskiy, Mikhail Rolo, Anabela G. Gomes, M. J. M. |
Palavras-chave: | Phonons Quantum dot Raman spectroscopy D. dielectric response D. phonons dielectric response |
Data: | 1997 |
Editora: | Pergamon Press |
Revista: | Solid state communications |
Citação: | "Solid state communications". 0038-1098. 104:7 (Nov. 1997) 381-386. |
Resumo(s): | We re-consider Raman scattering by LO-type phonons in a small semiconductor crystal and derive a simple formula taking into account the higher order confined phonon modes, to describe the asymmetric Raman lineshapes observed experimentally. For a single crystalline sphere, we explicitly calculate the relative contributions of the confined modes with different values of the radial quantum number. For arrays of such spheres, we argue that, apart from a superposition of the above contributions from individual scatterers, there exists a collective scattering by a coherent mode which involves many spheres, unless their concentration is too small. This collective scattering is determined by an effective dielectric function of the composite medium and peaks near the Fröhlich frequency. We apply these principles to the analysis and modelling of Raman spectra taken from CdS doped SiO2 films. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/5469 |
DOI: | 10.1016/S0038-1098(97)00356-6 |
ISSN: | 0038-1098 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - CEP - Artigos/Papers (with refereeing) CDF - FMNC - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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ssc.pdf | Documento principal | 1,13 MB | Adobe PDF | Ver/Abrir |