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The heuristic understanding of polarization operator?

  1. Feb 26, 2010 #1
    I find that some book e.g. Many-body theory of solids by John C. Inkson P145
    says that :" By analogy with the classical polarization, we define a polarization
    propagator through the relationship ... ε=1-vP" , where ε is the dielectronic response function, and v is the bare Coulomb potential.
    I do not remember such relationship in electrodynamics. Can anybody remind me of it?

    In fact, on the next page in the book, I find a new relationship i.e. P=δρ/δV, where V is the total potential instead of external potential and ρ is the electron density.
    But is there any similarity between this polarization function P and the classical polarization?
    Last edited: Feb 26, 2010
  2. jcsd
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