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Spin flips

  1. Jul 25, 2010 #1

    I have come across a sentance in an article which I do not quite understand.

    H1 is just a perturbation Hamiltonian.

    Why will spin flips only occur at the Fermi level?

    Thank you
  2. jcsd
  3. Jul 25, 2010 #2
    I'll take a wild guess that it is because the would-be flipped spin state is already occupied by another electron, for the states below the Fermi level. So the Pauli principle prevents it.
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