A simple and efficient route towards improved energetics within the framework of density-corrected density functional theory
Abstract
The crucial step in density-corrected Hartree-Fock density functional theory (DC(HF)-DFT) is to decide whether the density produced by the density functional for a specific calculation is erroneous and hence should be replaced by, in this case, the HF density. We introduce an indicator, based on the difference in non-interacting kinetic energies between DFT and HF calculations, to determine when the HF density is the better option. Our kinetic energy indicator directly compares the self-consistent density of the analysed functional with the HF density, is size-intensive, reliable, and most importantly highly efficient. Moreover, we present a procedure that makes best use of the computed quantities necessary for DC(HF)-DFT by additionally evaluating a related hybrid functional and, in that way, not only "corrects" the density but also the functional itself; we call that procedure corrected Hartree-Fock density functional theory (C(HF)-DFT).
Keywords
Cite
@article{arxiv.2304.04473,
title = {A simple and efficient route towards improved energetics within the framework of density-corrected density functional theory},
author = {Daniel Graf and Alex J. W. Thom},
journal= {arXiv preprint arXiv:2304.04473},
year = {2023}
}