Is the Exchange-Correlation Hole Truly Positive in a Homogeneous Electron Gas?

[saray1360]

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,

 

[kanato]

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.