Periodic Bootstrap Embedding

doi:10.1021/acs.jctc.3c00069

Periodic Bootstrap Embedding

2023-05-08

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DOI：10.1021/acs.jctc.3c00069

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Bootstrap embedding (BE) is a recently developed electronic structure method that has shown great success at treating electron correlation in molecules. Here, we extend BE to treat surfaces and solids where the wave function is represented in periodic boundary conditions using reciprocal space sums (i.e., k-point sampling). The major benefit of this approach is that the resulting fragment Hamiltonians carry no explicit dependence on the reciprocal space sums, allowing one to apply traditional nonperiodic electronic structure codes to the fragments even though the entire system requires careful consideration of periodic boundary conditions. Using coupled cluster singles and doubles (CCSD) as an example method to solve the fragment Hamiltonians, we present minimal basis set CCSD-in-HF results on 1D conducting polymers. We show that periodic BE-CCSD can typically recover similar to 99.9% of the electron correlation energy. We further demonstrate that periodic BE-CCSD is feasible even for complex donor- acceptor polymers of interest to organic solar cells-despite the fact that the monomers are sufficiently large that even a Gamma-point periodic CCSD calculation is prohibitive. We conclude that BE is a promising new tool for applying molecular electronic structure tools to solids and interfaces.

Keywords:

COUPLED-CLUSTER

CONFIGURATION-INTERACTION

SOLIDS

SYSTEMS

DOUBLES

FIELD

Periodic Bootstrap Embedding

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