[Pw_forum] About the flattening of phonon branches

[Stefano Baroni]

Hi: can you be more specific?
Also, would you mind signing your posts?
SB

On Jun 16, 2010, at 9:20 PM, Reza Ebraahimi wrote:

> Hello everyone
> I have a question, i wonder what is the physics behind the flatterning of the acoustic and optical phonon branches in some specific directions of the 1st Brillouin zone of some of the crystals? 
> Thanks for any comment
> 
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---
Stefano Baroni - SISSA  &  DEMOCRITOS National Simulation Center - Trieste
http://stefano.baroni.me [+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype)

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