DFT+U Type Strong Correlation Functional Derived from Multiconfigurational Wavefunction Theory

Benjamin G. Janesko

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arXiv · 2305.07736

DFT+U Type Strong Correlation Functional Derived from Multiconfigurational Wavefunction Theory

Benjamin G. Janesko

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Abstract

We present a DFT+U-type functional for strong correlation, derived from multiconfigurational wavefunction theory. The reference system experiences electron-electron interactions only in DFT+U-type atomic states, yielding a block-localized configuration interaction Hamiltonian which depends on the atomic state occupancies and the promotion energies of doubly excited determinants. Simple approximations for the promotion energies recover the flat-plane condition and provide beyond-zero-sum accuracy for iron spin-crossover complexes.

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Benjamin G. Janesko. 2023-05-12. DFT+U Type Strong Correlation Functional Derived from Multiconfigurational Wavefunction Theory. https://arxiv.org/abs/2305.07736

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