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Título

Transverse acoustic waves in piezoelectric ZnO/MgO and GaN/AlN Fibonacci-periodic superlattices

Autor Martínez-Gutiérrez, D.; Velasco, V. R.
Palabras clave Superlattices
Acoustic waves
Phonons
Fecha de publicación 2014
EditorElsevier
Citación Surface Science 624: 58-69 (2014)
ResumenThis work studies the transverse acoustic waves, including the piezoelectric coupling, in Fibonacci superlattices formed by wurtzite ZnO/MgO and GaN/AlN, respectively. We examine also other superlattice structures formed by combining different kinds of Fibonacci sequences and finite periodic systems. The possibility to use different Fibonacci sequences including layers with double length of one of the constituent materials produces important modifications in the dispersion curves. The effect is more important in the lower frequency range and affects the gaps appearing in this frequency range. It is also possible to find narrow and flat bands cutting the original gaps and producing narrower ones. There are modes at different frequency ranges having spatial confinement in one of the constituent parts of the superlattice period. © 2014 Elsevier B.V.
URI http://hdl.handle.net/10261/99077
DOI10.1016/j.susc.2014.01.020
Identificadoresdoi: 10.1016/j.susc.2014.01.020
issn: 0039-6028
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