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• W2000940037 abstract "The performance of linear-scaling electronic structure calculations depends critically on matrix sparsity. This article gives an overview of different strategies for removal of small matrix elements, with emphasis on schemes that allow for rigorous control of errors. In particular, a novel scheme is proposed that has significantly smaller computational overhead compared with the Euclidean norm-based truncation scheme of Rubensson et al. (J Comput Chem 2009, 30, 974) while still achieving the desired asymptotic behavior required for linear scaling. Small matrix elements are removed while ensuring that the Euclidean norm of the error matrix stays below a desired value, so that the resulting error in the occupied subspace can be controlled. The efficiency of the new scheme is investigated in benchmark calculations for water clusters including up to 6523 water molecules. Furthermore, the foundation of matrix sparsity is investigated. This includes a study of the decay of matrix element magnitude with distance between basis function centers for different molecular systems and different methods. The studied methods include Hartree–Fock and density functional theory using both pure and hybrid functionals. The relation between band gap and decay properties of the density matrix is also discussed." @default.
• W2000940037 created "2016-06-24" @default.
• W2000940037 creator A5068851533 @default.
• W2000940037 creator A5012366608 @default.
• W2000940037 date "2011-02-01" @default.
• W2000940037 modified "2023-10-14" @default.
• W2000940037 title "Bringing about matrix sparsity in linear-scaling electronic structure calculations" @default.
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• W2000940037 doi "https://doi.org/10.1002/jcc.21723" @default.
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