Atom-Based Bootstrap Embedding For Molecules

Atom-Based Bootstrap Embedding For Molecules
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基于原子的分子自举嵌入

DOI:
10.1021/acs.jpclett.9b02479
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发表时间:
2019
期刊:
The Journal of Physical Chemistry Letters
影响因子:
--
通讯作者:
Van Voorhis, Troy
Van Voorhis, Troy
中科院分区:
--
文献类型:
--
作者:
Ye, Hong-Zhou;Van Voorhis, Troy

文献摘要

相似文献

量子嵌入的最新发展为描述分子中的电子关联提供了一种很有吸引力的方法。然而,以前的方法,如密度矩阵嵌入理论(DMET),需要将系统严格划分为片段,这给分子带来了很大的模糊性。自举嵌入(BE)更灵活,因为它允许重叠碎片,但当逐个轨道地进行时,自举嵌入在定义轨道连接性方面引入了歧义。在这封信中,我们提出了一个基于原子的片段定义,它显著增强了Be在分子中的性能。由此产生的方法,我们称之为基于原子的BE,在中等大小的碱中恢复价电子关联非常有效,并使用外推提供接近化学精度的结果。我们预计,基于原子的BE可能导致一种低标度和高精度的大分子电子关联方法。
Recent developments in quantum embedding have offered an attractive approach to describing electron correlation in molecules. However, previous methods such as density matrix embedding theory (DMET) require rigid partitioning of the system into fragments, which creates significant ambiguity for molecules. Bootstrap embedding (BE) is more flexible because it allows overlapping fragments, but when done on an orbital-by-orbital basis, BE introduces ambiguity in defining the connectivity of the orbitals. In this Letter, we present an atom-based fragment definition that significantly augments BE’s performance in molecules. The resulting method, which we term atom-based BE, is very effective at recovering valence electron correlation in moderate-sized bases and delivers near-chemical-accuracy results using extrapolation. We anticipate atom-based BE may lead to a low-scaling and highly accurate approach to electron correlation in large molecules.