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Discrete breathers in 2D and 3D crystals
Author(s) -
Dmitriev Sergey V.,
Chetverikov Alexander P.,
Velarde Manuel G.
Publication year - 2015
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.201451673
Subject(s) - breather , excited state , amplitude , physics , graphane , lattice (music) , condensed matter physics , graphene , materials science , crystal (programming language) , nonlinear system , molecular physics , atomic physics , quantum mechanics , computer science , acoustics , programming language
Discrete breathers (DB) are spatially localized, large‐amplitude vibrational modes in defect‐free nonlinear lattices. Recent numerical and experimental studies have confirmed that DB exist in crystals. In the present work, we briefly describe the well‐known existence conditions of DB in crystals and present our recent results on DB in 2D crystals such as graphene and graphane and in 3D crystals such as alkali halide crystals and pure metals. The possible role of DB in solid state physics and materials science is discussed. Stroboscopic picture of atomic motions in the vicinity of discrete breather excited in graphene homogeneously strained with ϵ xx =0.3, ϵ yy =−0.1. Displacements of atoms from the equilibrium lattice positions are multiplied by the factor 4 for clarity. The discrete breather is of high spatial localization, so that only two atoms oscillate with a large amplitude.