Is the divide-and-conquer Hartree-Fock method valid for calculations of delocalized systems?

Tomoko Akama, Atsuhiko Fujii, Masato Kobayashi, Hiromi Nakai*

*この研究の対応する著者

研究成果: Article査読

38 被引用数 (Scopus)

抄録

Recently, we applied Yang's divide-and-conquer (DC) method to the Hartree-Fock (HF) and hybrid density functional theories and assessed its reliability in calculations of bond-alternating polyene chains. In this paper, we investigate the cut-off behaviour of the HF exchange interaction in the DC-HF method by comparing the results of bond-alternating polyene chains with those of more delocalized uniform polyene chains. The cut-off error of the uniform chain is much larger than that of the bond-alternating chain because of the delocalized electronic structure of the uniform polyene chain. We also estimate the exponential decay coefficient of the cut-off error in the DC scheme and compare it with that of the real-space one-particle density matrix, which can be represented by the band gap in the insulator limit. It can be concluded that the cut-off derived from the DC-HF method can be reduced to an arbitrary magnitude of error by adopting an appropriate buffer radius corresponding to the band gap.

本文言語English
ページ(範囲)2799-2804
ページ数6
ジャーナルMolecular Physics
105
19-22
DOI
出版ステータスPublished - 2007 10 21

ASJC Scopus subject areas

  • 生物理学
  • 分子生物学
  • 凝縮系物理学
  • 物理化学および理論化学

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