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Physics > Chemical Physics
Title: Assessing the Global Natural Orbital Functional Approximation on Model Systems with Strong Correlation
(Submitted on 6 Mar 2024 (v1), last revised 18 Apr 2024 (this version, v3))
Abstract: In the past decade, natural orbital functional (NOF) approximations have emerged as prominent tools for characterizing electron correlation. Despite their effectiveness, these approaches, which rely on natural orbitals and their associated occupation numbers, often require hybridization with other methods to fully account for all correlation effects. Recently, a global NOF (GNOF) has been proposed [Phys. Rev. Lett. 127, 233001 (2021)] to comprehensively address both dynamic and static correlations. This study evaluates the performance of GNOF on strongly correlated model systems, including comparisons with highly accurate Full Configuration Interaction (FCI) calculations for hydrogen atom clusters in one, two, and three dimensions. Additionally, the investigation extends to a BeH2 reaction, involving the insertion of a beryllium atom into a hydrogen molecule along a C2v pathway. According to the results obtained using GNOF, consistent behavior is observed across various correlation regions, encompassing a range of occupation and orbital schemes. Furthermore, distinctive features are identified when varying the dimensionality of the system.
Submission history
From: Mario Piris [view email][v1] Wed, 6 Mar 2024 08:56:40 GMT (74kb)
[v2] Thu, 7 Mar 2024 15:30:44 GMT (77kb)
[v3] Thu, 18 Apr 2024 08:26:39 GMT (77kb)
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