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Observation of acoustic modes inside the phonon dispersion gaps

โœ Scribed by V. Lemos; O. Pilla; M. Montagna; C.F. de Souza

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
163 KB
Volume
17
Category
Article
ISSN
0749-6036

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โœฆ Synopsis

Raman spectra of (S i / G e_{x} S i_{1-x}) superlattices have been measured, probing close to the mini Brillouin zone edge. The data reveal sharp lines appearing between those of folded phonon doublets. These lines have been interpreted with the aid of a computational method based on the photoelastic theory for low frequency Raman scattering by longitudinal acoustic phonons in finite size superlattices.

๐Ÿ“œ SIMILAR VOLUMES

Direct observation of the acoustic gaps
Direct observation of the acoustic gaps in Ge/GexSi1โˆ’x superlattices
โœ V. Lemos; O. Pilla; M. Montagna ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 85 KB

Raman spectra of Ge/Ge x Si 1-x superlattices were measured, probing close to the mini-Brillouin zone edge. The data reveal peculiar features in the low-wavenumber region of the spectra. These features are observed as dips superimposed on broad bands, the latter being related to the scattering of pu