Open AccessEffect of atomic fluctuation on the localized modes in one-dimensional system
Author(s) -
Dacheng Zhang,
Luxia Wang,
Desheng Liu,
Shuhua Han,
Shijie Xie
Publication year - 2003
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.52.3191
Subject(s) - polaron , physics , soliton , lattice (music) , condensed matter physics , work (physics) , mode (computer interface) , frame work , quantum mechanics , goldstone , quantum electrodynamics , nonlinear system , theoretical physics , electron , computer science , acoustics , operating system , geodesy , geography
In the frame work of the tight-binding approximation, the effect of defects and disorder on the vibrational modes in one-dimensional systems was studied through a random distribution model. It was found that the Goldstone mode of a so liton or polaron is pinned and its frequency is shifted up to a finite value. Th e weak mode g4 of a soliton is enhanced. The staggered modes keep the ir localization even if there is a large lattice fluctuation. Some new modes appear when the perfect soliton or polaron configuration is disturbed.