Dear Daniele,

many many thanks, very informative.

So when i increase the size of the box (let say from 30 to 40 a.u.), i have to increase the number of bands accordingly, too (let say from 300 to 500 bands) ?

Does this hold for dielectric matrix , too ? (So then i have to increase the dimension of dielectric matrix when increasing the size of box)

Should qp energies be also converged regarding charge oscillations as stated in your paper ???

Another point :

I used for ground state calculations in QE ibrav = 2 , which is FCC and very fast but when using ibrav = 1 , calculations are very slow and i have a bit different eigen-energies.

Should one better use ibrav = 1 or 2 in QE for box ???

Bests

Martin