Gap discrete breathers in 2D and 3D crystals

S.V. Dmitriev1
1Institute for Metals Superplasticity Problems RAS, Khalturin St. 39, 450001 Ufa
Abstract
Discrete breather (DB) is spatially localized vibrational mode of large amplitude in a defect-free crystal. The role of DB in condensed matter physics and materials science has been inten-sively studied during last decade. In the present brief review we summarize the results on gap DB in two- and three-dimensional crystals. We cover the following issues: proper-ties of DB in crystals at zero temperature; identification of DB at finite temperature; mechanisms of DB formation; possibil-ity to excite DB with frequency lying inside phonon band; effect of DB on crystal properties; etc.
Received: 08 May 2011   Revised: 19 June 2011   Accepted: 21 June 2011
Views: 85   Downloads: 13
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