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arXiv 2010.00527cond-mat.mtrl-sciphysics.chem-ph
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区域嵌入使表面科学的高水平量子化学成为可能

Regional Embedding Enables High-Level Quantum Chemistry for Surface Science

Bryan T. G. Lau, Gerald Knizia, Timothy C. Berkelbach

摘要:

与常用的密度泛函相比,从头算波函数方法可以提供更高的可靠性和准确性,这可能被证明是有用的,当建模吸附或缺陷,否则周期性系统。然而,平移对称性的破坏需要大的超晶胞,这对于相关波函数方法来说通常是禁止的。作为一种替代方案,我们介绍了区域嵌入方法,它使相关的波函数治疗只有一个目标片段的利益,通过小,片段本地化的轨道空间构造使用一个简单的重叠标准。应用于氢化锂、六方氮化硼和石墨烯衬底上的水吸附表明,结合焦点校正的区域嵌入可以提供具有非常小的碎片尺寸的收敛的CCSD(T)(耦合簇)吸附能。

英文摘要:

Compared to common density functionals, ab initio wave function methods can provide greater reliability and accuracy, which could prove useful when modeling adsorbates or defects of otherwise periodic systems. However, the breaking of translational symmetry necessitates large supercells that are often prohibitive for correlated wave function methods. As an alternative, we introduce the regional embedding approach, which enables correlated wave function treatments of only a target fragment of interest through small, fragment-localized orbital spaces constructed using a simple overlap criterion. Applications to the adsorption of water on lithium hydride, hexagonal boron nitride, and graphene substrates show that regional embedding combined with focal point corrections can provide converged CCSD(T) (coupled cluster) adsorption energies with very small fragment sizes.

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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