I am new to quantum espresso and yambo, but has some experience with abinit and DP codes. Recently, I find something that is wired to me:

I start from LDA+U, giving the k point grid as 4 4 4 0 0 0 (Gamma centered 4x4x4 grid) in QE that should give 64 k points in the full BZ (12 k points in the Irreducible part BZ), however, yambo finds only 58 k points in the FBZ. When I changed to LDA calculation of Si, giving the same k grid, yambo finds the correct number 64 for the FBZ....

I attached " r_setup" file from the LDA+U calculation to make my question clear.

Can someone tell me the reason? Maybe it is better to tell me how does yambo find the kpoints in FBZ from the k points in IBZ using the symmetry, e.g., tell me the routine where this is done.

Many thanks!

Cheers,

Sky