Accurate and Interpretable Representation of Correlated Electronic Structure via Tensor Product Selected CI

Accurate and Interpretable Representation of Correlated Electronic Structure via Tensor Product Selected CI
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通过张量积选择 CI 准确且可解释地表示相关电子结构

DOI:
10.1039/d4fd00049h
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发表时间:
2024
影响因子:
3.4
通讯作者:
Mayhall, Nicholas J.
Mayhall, Nicholas J.
中科院分区:
化学2区
文献类型:
--
作者:
Braunscheidel, Nicole M;Bachhar, Arnab;Mayhall, Nicholas J.

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The task of computing wavefunctions that are accurate, yet simple enough mathematical objects to use for reasoning, has long been a challenge in quantum chemistry. The difficulty in drawing physical conclusions from a wavefunction is often related to the generally large number of configurations with similar weights. In Tensor Product Selected Configuration Interaction (TPSCI), we use a locally correlated tensor product state basis, which has the effect of concentrating the weight of a state onto a smaller number of physically interpretable degrees of freedom. In this paper, we apply TPSCI to a series of three molecular systems ranging in separability, one of which is the first application of TPSCI to an open-shell bimetallic system. For each of these systems, we obtain accurate solutions to large active spaces, and analyze the resulting wavefunctions through a series of different approaches including (i) direct inspection of the TPS basis coefficients, (ii) construction of Bloch effective Hamiltonians, and (iii) computation of cluster correlation functions.
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