[Pw_forum] Pw_forum Digest, Vol 46, Issue 89
1009ukumar at gmail.com
Fri Apr 29 07:18:07 CEST 2011
Dear All QE users,
> (2) only cubic crystals has LO and TO braches.
crystals ( having considerable values of macroscopic dielectric constant [ i
epsilon infinity] and born effective charges, as pointed out by Prof. Eyvaz
Isaev) with low symmetry can, also, have LO-TO splitting. But this can be
different in different symmetry directions, so one has to search all
symmetry directions for this splitting.
For cubic crystals splitting is equal in all directions.
Indian Institute of Technology
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