One-phonon Raman scattering from arrays of semiconductor nano-crystals

• Type: Article in International Scientific Journal
• Date: 1997

Authors

Vasilevskiy, MI (Author) Other; Rolo, AG (Author) Other; Gomes, MJM (Author) Other

Journal

Title: Solid State Communications

Vol. 104

Pages: 381-386

ISSN: 0038-1098

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 35 Citations

Scopus - 34 Citations

Other information

Authenticus ID: P-001-AEB

DOI: 10.1016/s0038-1098(97)00356-6

Abstract (EN): 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 Frohlich frequency. We apply these principles to the analysis and modelling of Raman spectra taken from CdS doped SiO2 films. (C) 1997 Published by Elsevier Science Ltd.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6