[Pw_forum] LO-TO splitting in dynmat.x

sonu kumar 1009ukumar at gmail.com
Fri Apr 29 07:21:44 CEST 2011

Dear All QE users,

i am sorry again, as i havn't corrected the subject title.

(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.

with regards,

Sonu Kumar

Phd Student
Physics Department
Indian Institute of Technology
Delhi-110016, India
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