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Efficiency of free auxiliary models in describing interacting fermions: From the Kohn-Sham model to the optimal entanglement model
Density functional theory maps an interacting Hamiltonian onto the Kohn-Sham Hamiltonian, an explicitly free model with identical local fermion densities. Using the interaction distance, the minimum distance between the ground state of the interacting system and a generic free fermion state, we quantify the applicability and limitations of the exact …