[Pw_forum] Acoustic branches

[Stefano Baroni]

Dear Merlin. It is not possible to caculate the acoustic branch only.  
In case the acoustic branches cross upper ("optic") branches, I think  
it would not even be meaningful to do so. Stefano

On Jan 25, 2007, at 11:36 PM, meheut at impmc.jussieu.fr wrote:

>
>
> Dear Drs,
>
> I would like to use pwscf to compute the acoustic branches only of the
> crystal. I already computed the complete phonon dispersion, but the
> acoustic branches are crossing with other modes. Do you think possible
> to disjoin the acoustic modes frequencies from the other modes?
>
> Best wishes.
>
> Merlin meheut
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---
Stefano Baroni - SISSA  &  DEMOCRITOS National Simulation Center -  
Trieste
[+39] 040 3787 406 (tel) -528 (fax) / stefanobaroni (skype)

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