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[Fabien Bruneval <fabien.bruneval@cea.fr>]

Dear Tieyu,

This is not correct.
1) GW approximation is dynamic.
2) GW approximation is usually not performed self-consistently.
For these two reasons, there are several formulas to calculate the total 
energy within GW, which all agree at self-consistency, but which are 
different when doing 1-shot GW.
You can make a search for Galitsky-Migdal formula, RPA formula, Klein 
formula, Luttinger-Wards formula.
Just the RPA formula has been so far implemented in abinit for finite 
systems only (see the papers of M. Fuchs and X. Gonze).


Fabien



mailoliver@163.com wrote:
> Dear all:
>
> I try to get total energy of GWA. I try to do:
>
> 1. calcuating total energy and band energy by self consistent LDA or GGA
> 2. calcuating quasiparticle energies of all the k points in Brillouin zone. It
> needs do self consistent for energy and wavefunction?
> 3. total energy(GWA)=total energy(LDA)-band energy(LDA)+band energy(GWA)
>
> It is right? 
> Any comments or suggestions are wellcome.
>
> Tieyu Lu
>