A many-body expansion of the Fock matrix in the fragment molecular orbital method is derived up to three-body terms for restricted Hartree-Fock and density functional theory in the atomic orbital basis and compared to the expansion in the basis of fragment molecular orbitals (MOs). The physical nature of many-body corrections is revealed in terms of charge transfer terms. An improvement of the fragment MO expansion is proposed by adding exchange to the embedding. The accuracy of all developed methods is demonstrated in comparison to unfragmented results for polyalanines, a water cluster, Trp-cage (PDB: 1L2Y) and crambin (PDB: 1CRN) proteins, a zeolite cluster, a Si nano-wire, and a boron nitride ribbon. The physical nature of metallicity is discussed, and it is shown what kinds of metallic systems can be treated by fragment-based methods. The density of states is calculated for a fully closed and a partially open nano-ring of boron nitride with a diameter of 105 nm.
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14 September 2017
Research Article|
September 13 2017
Many-body expansion of the Fock matrix in the fragment molecular orbital method
Dmitri G. Fedorov
;
Dmitri G. Fedorov
a)
1
Research Center for Computational Design of Advanced Functional Materials (CD-FMat), National Institute of Advanced Industrial Science and Technology (AIST)
, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
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Kazuo Kitaura
Kazuo Kitaura
2
Fukui Institute for Fundamental Chemistry, Kyoto University
, Takano-Nishihiraki-cho 34-4, Sakyou-ku, Kyoto 606-8103, Japan
3
Advanced Institute for Computational Science (AICS), RIKEN
, 7-1-26 Minatojima-minami-machi, Chuo-ku, Kobe, Hyogo 650-0047, Japan
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a)
Author to whom correspondence should be addressed: d.g.fedorov@aist.go.jp
J. Chem. Phys. 147, 104106 (2017)
Article history
Received:
May 16 2017
Accepted:
August 17 2017
Citation
Dmitri G. Fedorov, Kazuo Kitaura; Many-body expansion of the Fock matrix in the fragment molecular orbital method. J. Chem. Phys. 14 September 2017; 147 (10): 104106. https://doi.org/10.1063/1.5001018
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