Projector-Based Quantum Embedding for Molecular Systems: An Investigation of Three Partitioning Approaches

dc.contributor.author Waldrop, Jonathan
dc.contributor.author Windus, Theresa
dc.contributor.author Govind, Niranjan
dc.contributor.department Ames Laboratory
dc.contributor.department Chemistry
dc.date 2021-08-05T17:40:51.000
dc.date.accessioned 2021-08-14T01:37:55Z
dc.date.available 2021-08-14T01:37:55Z
dc.date.embargo 2022-07-14
dc.date.issued 2021-07-14
dc.description.abstract <p>Projector-based embedding is a relatively recent addition to the collection of methods that seek to utilize chemical locality to provide improved computational efficiency. This work considers the interactions between the different proposed procedures for this method and their effects on the accuracy of the results. The interplay between the embedded background, projector type, partitioning scheme, and level of atomic orbital (AO) truncation are investigated on a selection of reactions from the literature. The Huzinaga projection approach proves to be more reliable than the level-shift projection when paired with other procedural options. Active subsystem partitioning from the subsystem projected AO decomposition (SPADE) procedure proves slightly better than the combination of Pipek–Mezey localization and Mulliken population screening (PMM). Along with these two options, a new partitioning criteria is proposed based on subsystem von Neumann entropy and the related subsystem orbital occupancy. This new method overlaps with the previous PMM method, but the screening process is computationally simpler. Finally, AO truncation proves to be a robust option for the tested systems when paired with the Huzinaga projection, with satisfactory results being acquired at even the most severe truncation level.</p>
dc.identifier archive/lib.dr.iastate.edu/ameslab_manuscripts/966/
dc.identifier.articleid 1973
dc.identifier.contextkey 24197821
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_manuscripts/966
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/RwyqABLw
dc.language.iso en
dc.relation.ispartofseries IS-J 10561
dc.source.uri https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=2323&context=chem_pubs
dc.subject.disciplines Physical Chemistry
dc.subject.keywords Algorithms
dc.subject.keywords Embedding
dc.subject.keywords Energy
dc.subject.keywords Chemical calculations
dc.subject.keywords Density functional theory
dc.title Projector-Based Quantum Embedding for Molecular Systems: An Investigation of Three Partitioning Approaches
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
relation.isOrgUnitOfPublication 42864f6e-7a3d-4be3-8b5a-0ae3c3830a11
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