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|Type:||Artigo de periódico|
|Title:||Acoustic phonons in superlattices|
|Abstract:||Some recent publications related to acoustic phonon scattering in superlattices are reviewed. New information on the Raman spectroscopy of diamond-like constituent superlattices is also presented. The data reveal sharp lines appearing between those of folded phonon doublets inside the acoustic gaps. We show that the gap mode frequencies are characteristic of the bilayer system, taken as the unit cell of the superlattice. Spectra from highly absorbent superlattices show pronounced dips in intensity that are superimposed on the broad band scattering. Absorption is responsible for the broadening, thus revealing the dips which are typical features of acoustic gaps. The fine structure in the spectra of short-period superlattices is compared with the projected density of states. It is shown that the fine structure appears because of finite size effects. A calculation of low-frequency Raman scattering used for modeling the experimental spectra serves as base for the physical interpretation of the results.|
|Editor:||Soc Brasileira Quimica|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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