Using a micro-Raman setup, in-plane Raman scattering was performed on short-period (001)-Si/Ge superlattices, and the complete phonon spectrum (longitudinal and transverse, optical and acoustic modes) could be studied. In the relevant wave-vector range, the in-plane dispersion was found to affect the frequencies of folded-acoustic modes, while being negligible for confined optical modes. The comparison with theoretical spectra, calculated by means of first-principles interatomic force constants, shows that the observed deviations of ''unfolded'' confined optical modes from the bulk dispersions can be attributed to interface roughness and is well described by a simple alloy layer model (2-3 intermixed SiGe atomic layers at interfaces).

INPLANE RAMAN-SCATTERING OF (001)-SI/GE SUPERLATTICES - THEORY AND EXPERIMENT / Schorer, R; Abstreiter, G; Degironcoli, S; Molinari, Elisa; Kibbel, H; Presting, H.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - STAMPA. - 49:(1994), pp. 5406-5414.

INPLANE RAMAN-SCATTERING OF (001)-SI/GE SUPERLATTICES - THEORY AND EXPERIMENT

MOLINARI, Elisa;
1994

Abstract

Using a micro-Raman setup, in-plane Raman scattering was performed on short-period (001)-Si/Ge superlattices, and the complete phonon spectrum (longitudinal and transverse, optical and acoustic modes) could be studied. In the relevant wave-vector range, the in-plane dispersion was found to affect the frequencies of folded-acoustic modes, while being negligible for confined optical modes. The comparison with theoretical spectra, calculated by means of first-principles interatomic force constants, shows that the observed deviations of ''unfolded'' confined optical modes from the bulk dispersions can be attributed to interface roughness and is well described by a simple alloy layer model (2-3 intermixed SiGe atomic layers at interfaces).
49
5406
5414
INPLANE RAMAN-SCATTERING OF (001)-SI/GE SUPERLATTICES - THEORY AND EXPERIMENT / Schorer, R; Abstreiter, G; Degironcoli, S; Molinari, Elisa; Kibbel, H; Presting, H.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER. - ISSN 0163-1829. - STAMPA. - 49:(1994), pp. 5406-5414.
Schorer, R; Abstreiter, G; Degironcoli, S; Molinari, Elisa; Kibbel, H; Presting, H.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/10780
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