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Kohn-Sham Eigen values?

  1. Sep 20, 2011 #1
    Kohn-Sham Eigen values????

    Hi everybody...
    I have read about Density functional theory and Kohn-Sham theorem, I have found in many references that the Kohn-Sham Eigen values have no physically meaning, except the highest Eigen value has been proved by the Sham and Kohn as the Chemical potential and by perdew,Parr,Levy and Balduz as the negative of the ionization energy
    my question is, what is the different between chemical potential, ionization energy, band gap energy and Fermi level???
    I really wanted understand this but I couldn't..
    thanks with best regards
  2. jcsd
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