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Acoustic phonon power spectra in a periodic superlattice
Author(s) -
Mauriz P. W.,
Vasconcelos M. S.,
Albuquerque E. L.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541513
Subject(s) - phonon , superlattice , formalism (music) , dissipation , spectral line , wave vector , physics , condensed matter physics , power law , excitation , statistical physics , quantum mechanics , mathematics , art , musical , statistics , visual arts
We consider a Green function formalism, based on the frequency distribution, to study the propagation of acoustic phonon modes in a periodic superlattice. The calculations are based on the linear response function approach, which is very convenient to deal with this kind of problem. A damping term γ is included in a phenomenological way into the wavevector expression. In order to examine the phonon excitation, we also determine, by using the fluctuation‐dissipation theorem, their power spectra, which have many interesting properties. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)