Please use this identifier to cite or link to this item:
|Title:||Disturbance spreading in incommensurate and quasiperiodic systems||Authors:||Hu, B.
|Issue Date:||1-Apr-2000||Citation:||Hu, B.,Li, B.,Tong, P. (2000-04-01). Disturbance spreading in incommensurate and quasiperiodic systems. Physical Review B - Condensed Matter and Materials Physics 61 (14) : 9414-9418. ScholarBank@NUS Repository.||Abstract:||The propagation of an initially localized excitation in one-dimensional incommensurate, quasiperiodic and random systems is investigated numerically. It is discovered that the time evolution of variances σ2(t) of atom displacements depends on the initial condition. For the initial condition with nonzero momentum, σ2(t) goes as tα with α=1 and 0 for incommensurate Frenkel-Kontorova model at V below and above Vc respectively, and α=1 for uniform, quasiperiodic and random chains. It is also found that α=1-β with β the exponent of distribution function of frequency at zero frequency, i.e., ρ(ω)∼ωβ (as ω→0). For the initial condition with zero momentum, α=0 for all systems studied. The underlying physical meaning of this diffusive behavior is discussed. ©2000 The American Physical Society.||Source Title:||Physical Review B - Condensed Matter and Materials Physics||URI:||http://scholarbank.nus.edu.sg/handle/10635/96257||ISSN:||01631829|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Mar 29, 2020
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.