Abstract
The calculation of the Raman spectra of AlxGa1-xN/GaN superlattices for
the whole aluminum concentration range was performed in this work. The
highest frequency modes are greatly influenced by the Al molar fraction.
An interface with thickness varying in steps of one monolayer up to
three was included. Severe changes in the middle frequency range of the
Raman spectra are induced by the presence of interfaces. The changes in
the atomic displacements and the phonon dispersion relations are
discussed. (C) 2004 Elsevier B.V. All rights reserved.
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