Atom-Based Bootstrap Embedding For Molecules
Atom-Based Bootstrap Embedding For Molecules
复制标题
基于原子的分子自举嵌入
DOI:
10.1021/acs.jpclett.9b02479
复制
发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Van Voorhis, Troy
中科院分区:
文献类型:
--
作者:
Ye, Hong-Zhou;Van Voorhis, Troy
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.