[Pw_forum] Regarding LA-TA modes

Kondaiah Samudrala konda.physics at gmail.com
Sat Jul 12 16:38:39 CEST 2014

Dear all,

I am very much interested in knowing  LA-TA modes and grunessian parameter
calculations using pwscf.

Is it possible to get non zero acoustic modes at Gamma point. Because, If I
am applying asr rule at gamma point, the acoustic modes are zero in my
case. How can we define LA-TA modes ???

Is degenerative modes (Out of First three modes)  are transverse modes???

How to do grunessinn parameter calculations for entire phonon spectrum  in

Hope positive reply..Thanks in advance

with regards
S. Appalakondaiah
PhD student
University of Hyderabad
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