[Wien] Hartree-Fock and the Hubbard Model

[delamora]

Dear WIEN2k community,

>From what I understand the Hubbard Model is to calculate the electronic repulsion inside the orbitals, specially in the 3d and 4f.

Is it an approximation for the Hartree Fock exchange?

If this is the case then it can be better calculated exact-exchange functionals (1, 2)

1) 4.5.7 Onsite-exact-exchange and hybrid functionals for correlated electrons

2) 4.5.8 Unscreened and screened hybrid functionals

Cheers

          Pablo de la Mora

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