Dear; When using optical moudle of siesta to calculate optical property of monolayer graphene, we can get *dielectric permittivity ( episolon=epsilon_real + iepsilon_img) \ complex refractive index( **n**=n+ik *) etc from results,but not *magnetic permeability(miu)*. When consider the relation between epsilon\miu\n,I find *n**=sqrt(epsilon)*,which means *miu=4*pi*10^(-7)*,ie magnetic permeability of graphen is a constant, just like air. Is it right that magnetic permeability of graphene is a constant? If not,how do we set the fdf profile to correctly calculate magnetic permeability of graphene? The attachment is the fdf profile I used. Hope your explaining! Best wishes! linxiao from ZJU
graphenel.fdf
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