Dear Wang:
> LO-TO splitting always exists in Brillouin zone, but two points are worth
> > noting:
> >
> I do not think so. I do not find any LO-TO splitting at the X and R point of
> Brillouin zone of cubic.
This could depend on the definition of "LO-TO splitting", which I meant "the
reduction of the LO-TO degeneracy".
If it is defined to be the splitting due to the long-range electric force on
LO, it will disappear in BZ zone.
Best Wishes!
Yours Sincerely
L. F. Huang
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L.F.Huang(???) DFT and phonon physics
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Add: Research Laboratory for Computational Materials Sciences,
Instutue of Solid State Physics,the Chinese Academy of Sciences,
P.O.Box 1129, Hefei 230031, P.R.China
Tel: 86-551-5591464-326(office)
Fax: 86-551-5591434
Our group: http://theory.issp.ac.cn
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