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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
2009010473.pdf
[fulltext] 166 KB
Title
Ladder lattice model of soft optical phonon
Creators Mashiyama Hiroyuki
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
info:doi/10.1143/JPSJ.79.024601
[isVersionOf] [URI]http://jpsj.ipap.jp/
Schools 大学院理工学研究科(理学)