Fermi level and Fermi function http://hyperphysics.phy-astr.gsu.edu/hb ... mi.html#c4 hyperphysics.phy-astr.gsu.edu/hbase/Solids/Fermi.html hyperphysics.phy-astr.gsu.edu/hbase/Solids/Fermi.html hyperphysics.phy-astr.gsu.edu/hbase/Solids/Fermi.html