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. 2018 Jul 3;14(8):4072–4087. doi: 10.1021/acs.jctc.8b00292

Figure 2.

Figure 2

Hxc energy EHxcKS (dashed line) and the corresponding energy term of the keKS system EMxc (continuous line) for a Hubbard dimer at half-filling with local potential Δv/t = 1 as a function of U/t. We see that for U > 0 it holds that EMxcke < EHxc.