Ladder lattice model of soft optical phonon
Journal of the Physical Society of Japan Volume 79 Issue 2
Page 024601-
published_at 2010-02-10
Title
Ladder lattice model of soft optical phonon
Creator Keywords
soft mode
anticrossing
acoustic and optical branch
dispersion relation
phonon spectrum
ferroelectric phase transition
A linear lattice model for demonstrating a soft optical mode at a zone center is proposed. The unit cell consists of only two atoms. If the optical mode is sufficiently soft, anticrossing takes place between the optical and acoustic phonon branches. By using the generalized Langevin's equation method, the spectral function is calculated analytically. The intensity of the optical mode disappears at approximately the anticrossing wave number. In general, the spectral line shape of the optical mode is asymmetric because of the interaction between the two branches.
Languages
eng
Resource Type
journal article
Publishers
The Physical Society of Japan
Date Issued
2010-02-10
Rights
c2010 The Physical Society of Japan()
File Version
Author’s Original
Access Rights
open access
Relations
[ISSN]0031-9015
[NCID]AA00704814
[isVersionOf]
[URI]http://jpsj.ipap.jp/
Schools
大学院理工学研究科（理学）