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Vanishing soft mode in phonon spectrum of ladder lattice

Ferroelectrics : the international journal devoted to the theoritical, experimental, and applied aspects of ferroelectrics and related materials Volume 414 Page 48-54
published_at 2011
2011010011.pdf
[fulltext] 351 KB
Title
Vanishing soft mode in phonon spectrum of ladder lattice
Creators Mashiyama Hiroyuki
Creator Keywords
soft phonon optical and acoustic branches anticrossing dispersion relation phonon spectrum ferroelectric transition
A ladder lattice model is studied analytically to understand the coupling between the acoustic and optical phonons. When the optical phonon becomes soft at a G-point, the anticrossing between the two branches takes place. In a simple case, the optical spectral intensity vanishes around the anticrossing wave number. The coupled spectral function is not a simple superposition of two damped harmonic forms. It is shown that the off-diagonal component of static susceptibility for the elastic and polar waves is decisive to obtain the correct spectral intensity.
Subjects
物理学 ( Other)
Languages eng
Resource Type journal article
Publishers Gordon and Breach Science Pub
Date Issued 2011
File Version Author’s Original
Access Rights open access
Relations
[ISSN]0015-0193
[NCID]AA00644949
info:doi/10.1080/00150193.2011.577295
[isVersionOf] [URI]http://www.tandfonline.com/loi/gfer20
Schools 大学院理工学研究科(理学)