Yambo Community Forum

Hello all,
I want to know what GphBRnge means. I can't find an explanation on the Yambo website. Should I converge it? By the way, when I increase it, the vbm or cbm energy correction oscillates significantly, and they don't seem to converge at all. I am really confused. thank you very much!

Xiaowei

Dear Xiaowei,

GphBRnge has been introduced in order to check the effect of different phonon branches groups (acoustic, optic) on the renormalization of the electronic gap..

You have to include all of them.

Elena

Dear Elena,
Thank you for your reply. I read the source file. GphBrnge seems to be the electronic band range when calculating the electron-phonon self-energy. Is this correct?
Xiaowei

Dear Xiaowei,

sorry it is my fault, I was thinking of ElPhModes.

Yes, GphBRnge is the number of electronic bands that you want to include in the calculation of band gap renormalization for example.
In principle it is a parameter whose convergence must be checked. In practice it comes from a previous quantum espresso nscf calculation.

So at the level of the tutorial you have to play with the value which automatically comes out when you prepare your input file.

Elena