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Bulk and Surface Phonons in Superlattices
Abstract The study of acoustic wave propagation in layered media [1] found its original motivation in the desire for an accurate description of the propagation of seismic shocks through Earth’s crust, whose density and elastic properties vary with distance from the surface of Earth. With the development of techniques for fabricating artificial superlattices (SL), interest is beginning to turn to the study of vibrations in such periodically modulated structure. The SL has a larger periodicity in the direction perpendicular to the s labs, and therefore many phonon branches in the folded Brillouin zone. In the gaps between these branches may appear localized modes associated to defects, and in particular to the surface of a semi-infinite SL. Here we give a summary of the recent theoretical works on the vibrations in infinite and semi-infinite SL; the experimental aspects (Raman and Brillouin scattering) are reviewed by J. SAPRIEL and by C.M. FALCO et al [2]. The films in the SL are first treated as elastic continuum media, characterized by their elastic constants and their densities; this approach is complemented by use of simple atomic models to describe the dynamics of the SL.
Bulk and Surface Phonons in Superlattices
Abstract The study of acoustic wave propagation in layered media [1] found its original motivation in the desire for an accurate description of the propagation of seismic shocks through Earth’s crust, whose density and elastic properties vary with distance from the surface of Earth. With the development of techniques for fabricating artificial superlattices (SL), interest is beginning to turn to the study of vibrations in such periodically modulated structure. The SL has a larger periodicity in the direction perpendicular to the s labs, and therefore many phonon branches in the folded Brillouin zone. In the gaps between these branches may appear localized modes associated to defects, and in particular to the surface of a semi-infinite SL. Here we give a summary of the recent theoretical works on the vibrations in infinite and semi-infinite SL; the experimental aspects (Raman and Brillouin scattering) are reviewed by J. SAPRIEL and by C.M. FALCO et al [2]. The films in the SL are first treated as elastic continuum media, characterized by their elastic constants and their densities; this approach is complemented by use of simple atomic models to describe the dynamics of the SL.
Bulk and Surface Phonons in Superlattices
Djafari-Rouhani, B. (author)
1985-01-01
2 pages
Article/Chapter (Book)
Electronic Resource
English
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