What would be a good Internet link that would properly explain Fermi Energy or (Fermi Level)? How does the Fermi Energy of a material vary with external influence, such as doping of the material, and applied electric and magnetic fields for instance? What other factors can effect Fermi Energy? In single walled carbon nanotubes, do you know a general published equation that describes the Fermi Energy? how does the Fermi Energy vary with the geometric shape, i.e. length and radius of the nanotube? How does the chirality of the nanotube effect the Fermi Energy?