Ground state energy in GW calculation

[vaspGG]

Dear All,
I am an old vasp user, but new to GW calculation. For now, I can run some examples and pick out the quantity such as band gap successfully. However, my main purpose is to evaluate the ground state energy of different structures, and now I can not find the data of ground state energy in the OUTCAR of the GW run. Can any one tell me?

Another problem is that for a material which is metallic according to GGA calculations, is it reasonable to do a GW calculation at GGA level to get the band gap, considering the LOPTICS = T is set in the GW calculation which might be meaningless for a metallic system I think.

I appreciate any response, Many Thanks!

[admin]

GW gives only quasiparticle energies, not ground state energy of the system.
Ground state energy is calculated in RPA (correlated part).

When the system is metallic according to GGA
starting GW is not worth doing.
Better strategy is GGA+HSE and then GW.

[vaspGG]

GW gives only quasiparticle energies, not ground state energy of the system.
Ground state energy is calculated in RPA (correlated part).

When the system is metallic according to GGA
starting GW is not worth doing.
Better strategy is GGA+HSE and then GW.

Cheers！