The ABINIT Users Mailing List ( CLOSED )

[Valerio Olevano <valerio.olevano@polytechnique.fr>]

Dear Wu,

the input parameter you refer on is in fact not the plasma frequency
but a parameter of the plasmon pole model (excuse for the unhappy naming
chosen for).
In principle results do not change by  changing it.
It's a good recipe to chose it to be close to the plasma frequency of
your material. Starting from the very last (4.3?) version, this is going
to be the default. 
For previous versions, and if you are a purist  of "ab initio",
set it at the classical plasma frequency by taking the reported
(in the log file) average density of the system and evaluate
omega_p = sqrt( 4 PI n ).

regards

V. Olevano

> Dear all,
> 
>     In the GW calculation, an input called plasma frequency is needed.
> Can anyone give me the way to derive the plasma frequency? Since our
> calculation is called a first principle one, this is important and out
> of empirical factor.
>     In Test_v3/t31.in, I changed the plasma frequency, and the
> correction was also changed. 
> 
>     Regards
> 
>     Rongqin Wu
> 
>