Optical phonon spectra of GaSb/AlSb superlattices: Influence of strain and interface roughnesses

Raman spectroscopy indicates the formation of extended intermixture alloy regions at the interfaces in the GaSb/AlSb superlatttices, which suppress the optical confined modes. A misfit strain was found to be responsible for the high-frequency shift of the optical phonons confined in the AlSb layers....

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Bibliographic Details
Published in:Journal of applied physics 1996-07, Vol.80 (1), p.597-599
Main Authors: da Silva, S. W., Pusep, Yu. A., Galzerani, J. C., Lubyshev, D. I., Milekhin, A. G., Preobrazhenskii, V. V., Putiato, M. A., Semjagin, B. R.
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Language:English
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Summary:Raman spectroscopy indicates the formation of extended intermixture alloy regions at the interfaces in the GaSb/AlSb superlatttices, which suppress the optical confined modes. A misfit strain was found to be responsible for the high-frequency shift of the optical phonons confined in the AlSb layers. It turned out that, in the ultrathin layer GaSb/AlSb superlattices with layer thicknesses less than 7 monolayers, the strain was completely relaxed in the alloy interface regions.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.362725