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Post-Kohn–Sham Random-Phase Approximation and Correction Terms in the Expectation-Value Coupled-Cluster Formulation

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dc.abstract.enUsing expectation-value coupled-cluster theory and many-body perturbation theory (MBPT), we formulate a series of corrections to the post-Kohn–Sham (post-KS) random-phase approximation (RPA) energy. The beyond-RPA terms are of two types: those accounting for the non-Hartree–Fock reference and those introducing the coupled-cluster doubles non-ring contractions. The contributions of the former type, introduced via the semicanonical orbital basis, drastically reduce the binding strength in noncovalent systems. The good accuracy is recovered by the attractive third-order doubles correction referred to as Ec2g. The existing RPA approaches based on KS orbitals neglect most of the proposed corrections but can perform well thanks to error cancellation. The proposed method accounts for every contribution in the state-of-the-art renormalized second-order perturbation theory (rPT2) approach but adds additional terms which initially contribute in the third order of MBPT. The cost of energy evaluation scales as noniterative (4) in the implementation with low-rank tensor decomposition. The numerical tests of the proposed approach demonstrate accurate results for noncovalent dimers of polar molecules and for the challenging many-body noncovalent cluster of CH4···(H2O)20.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorModrzejewski, Marcin
dc.contributor.authorTucholska, Aleksandra
dc.contributor.authorCieśliński, Dominik
dc.date.accessioned2024-01-25T17:16:48Z
dc.date.available2024-01-25T17:16:48Z
dc.date.copyright2023-09-29
dc.date.issued2023
dc.description.accesstimeAT_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number19
dc.description.versionFINAL_PUBLISHED
dc.description.volume19
dc.identifier.doi10.1021/ACS.JCTC.3C00496
dc.identifier.issn1549-9618
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/116614
dc.identifier.weblinkhttps://pubs.acs.org/doi/pdf/10.1021/acs.jctc.3c00496
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofJournal of Chemical Theory and Computation
dc.relation.pages6619-6631
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titlePost-Kohn–Sham Random-Phase Approximation and Correction Terms in the Expectation-Value Coupled-Cluster Formulation
dc.typeJournalArticle
dspace.entity.typePublication