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arXiv 2312.03375physics.chem-ph
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一种结合点群对称性利用与双电子积分 Cholesky 分解的新型耦合簇单双激发实现

A novel coupled-cluster singles and doubles implementation that combines the exploitation of point-group symmetry and Cholesky decomposition of the two-electron integrals

Tommaso Nottoli, Jürgen Gauss, Filippo Lipparini

AI总结:

提出一种融合 Abelian 点群对称性与双电子积分 Cholesky 分解的新型 CCSD 实现,并通过两种粒子–粒子阶梯项计算策略完成 C$_{60}$ 大规模冻芯相关能计算。

摘要:

本文提出一种耦合簇单双激发(CCSD)方法的新型实现,专门针对大型对称体系的处理而设计。该实现充分利用 Abelian 点群对称性,并采用双电子排斥积分的 Cholesky 分解。按照现代 CCSD 算法,我们提出了两种用于计算所谓粒子–粒子阶梯项的替代策略。程序会根据可用硬件资源趋向最优选择。作为一项大规模应用,我们使用极化价三 zeta 基组计算了巴克敏斯特富勒烯(C$_{60}$)的冻芯相关能,其中包含 240 个相关电子和 1740 个轨道。

英文摘要:

A novel implementation of the coupled-cluster singles and doubles (CCSD) approach is presented that is specifically tailored for the treatment of large, symmetric systems. It fully exploits Abelian point-group symmetry and the use of the Cholesky decomposition of the two-electron repulsion integrals. In accordance with modern CCSD algorithms, we propose two alternative strategies for the computation of the so-called particle-particle ladder term. The code is driven towards the optimal choice depending on the available hardware resources. As a large-scale application, we computed the frozen-core correlation energy of buckminsterfullerene (C$_{60}$) with a polarized valence triple-zeta basis set (240 correlated electrons in 1740 orbitals).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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