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A DFT+U type functional derived to explicitly address the flat plane condition

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arxiv 2210.17404 v1 pith:6UZ5W5MW submitted 2022-10-31 cond-mat.str-el cond-mat.mtrl-sciphysics.chem-phphysics.comp-phquant-ph

classification cond-mat.str-elcond-mat.mtrl-sciphysics.chem-phphysics.comp-phquant-ph
keywords functionalderivedconditiondissociatederrorsflathubbardplane
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A new DFT+U type corrective functional is derived from first principles to enforce the flat plane condition on localized subspaces, thus dispensing with the need for an ad hoc derivation from the Hubbard model. The newly derived functional as given by equation 5 yields relative errors below 0.6% in the total energy of the dissociated s-block dimers as well as the dissociated H5+ ring system. In comparison bare PBE and PBE+U (using Dudarev's 1998 Hubbard functional) yields relative energetic errors as high as 8.0% and 20.5% respectively.

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