I want to calculate the band energies of a 2D material with respect to the vacuum level to normalize my band energies with Quantum Espresso. I found a post here, which was not really satisfying for me. Is this the only way to do it?
Another question that I am asking myself is; suppose I apply an electric field in z-direction to the 2D material. Would it still be possible to compute the vacuum level in that case, because my potential would be altered by the applied electric field?