Title: Density of states of interacting quasilocal harmonic modes in glasses
Authors: Parshin, DA
Laermans, Christiane #
Issue Date: May-2002
Publisher: Elsevier science bv
Series Title: Physica b-condensed matter vol:316 pages:542-544
Abstract: We have established for the first time that as a result of a bilinear coupling between quasilocal harmonic modes and phonons in glasses there should be always a correlation between the position of the boson peak and the Ioffe-Regel crossover frequency for phonons. Above this frequency, phonons (i.e. usual plane waves) cease to exist. At the same frequency the density of states of the quasilocal harmonic modes, as a result of their interaction (and strong level repulsion), transforms into a universal linear function of the frequency. As a result the new harmonic modes become completely delocalized and have a diffusive nature. We show that existing experimental data are in excellent agreement with these predictions. (C) 2002 Elsevier Science B.V. All rights reserved.
ISSN: 0921-4526
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Semiconductor Physics Section
# (joint) last author

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