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Exchange-correlation hole

  1. Apr 9, 2009 #1
    Hi,

    Why do we say that the exchange correlation hole is "positive" in a medium like a homogeneous electron gas, while all the particles are electrons with negative charge.

    Is only the deficit of the electron mean positive charge?

    Regards,
     
  2. jcsd
  3. Apr 9, 2009 #2
    Basically, yes. You can think of it as in the jellium model, where there is a uniform positive background charge, and a removal of electron charge by the exchange-correlation hole leaves behind just the positive background charge, making the xc hole positive.
     
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