Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2009-08-10
Proc. 16th Int. Symp. "Nanostructures: Physics and Technology", Vladivostok, Russia, July 14-18, 2008
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Reported at the 16th Int. Symp. "Nanostructures: Physics and Technology", Vladivostok, Russia, July 14-18, 2008
Scientific paper
We used Raman scattering for study the phonon modes of self-organized Ge/Si quantum dots, grown by a molecular-beam epitaxy method. It is revealed, that Ge-Ge and Si-Ge vibrational modes considerably intensify at excitation of exciton between the {Lambda}3 valence and {Lanbda}1 conduction bands (transitions E1 and E1+{Delta}1), that allows to observe Raman scattering spectrum from extremely small volumes of Ge, even from one layer of quantum dots with the layer thickness of ~ 10 A. It is shown that Si diffuses into the Ge quantum dots from the Si spacer layers forming Ge_xSi_{1-x} solid solution, and Si concentration was estimated. It is revealed, that the frequency of Ge-Ge mode decreases in 10 1/cm at decreasing of the Ge layer thickness from 10 up to 6 A as a result of phonon size confinement effect.
Arapkina Larisa V.
Chapnin V. A.
Chizh K. V.
Kucherenko I. V.
Mel'nik N. N.
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