I try to reproduce the dielectric function as the picture bellow using Yambo code but the values that I have found in y-axis are so much bigger [-1000,1500] compared to literature. I generated the scf file using Quantum ESPRESSO then I used Yambo to generate the dielectric function.
I have doubts that the problem can be related to the occupations type and degauss value. Actually I used occupations ='fixed' in the scf , then when I changed it to smearing the y-axis values reduced a little bit but I'm still far from the literature.
Can someone clarify my doubts about that, please? And which occupations type and degauss value I should use?
PS: I already encountered same problem in other calculations like DOS.
Link of the paper from which I took the picture: https://www.sciencedirect.com/science/article/pii/S092145260600189X