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Projected Hartree-Fock theory as a polynomial of particle-hole excitations and its combination with variational coupled cluster theory

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4983065· OSTI ID:1465952
 [1];  [2];  [2]
  1. Rice Univ., Houston, TX (United States). Department of Chemistry; Department of Chemistry, Rice University, Houston, Texas 77005-1892, USA
  2. Rice Univ., Houston, TX (United States). Department of Chemistry and Department of Physics and Astronomy
Projected Hartree-Fock theory provides an accurate description of many kinds of strong correlations but does not properly describe weakly correlated systems. Coupled cluster theory, in contrast, does the opposite. It therefore seems natural to combine the two so as to describe both strong and weak correlations with high accuracy in a relatively black-box manner. Combining the two approaches, however, is made more difficult by the fact that the two techniques are formulated very differently. In earlier work, we showed how to write spin-projected Hartree-Fock in a coupled-cluster-like language. Here in this work, we fill in the gaps in that earlier work. Further, we combine projected Hartree-Fock and coupled cluster theory in a variational formulation and show how the combination performs for the description of the Hubbard Hamiltonian and for several small molecular systems.
Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Complex Materials from First Principles (CCM); Rice Univ., Houston, TX (United States). Department of Chemistry
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0001474; SC0012575
OSTI ID:
1465952
Alternate ID(s):
OSTI ID: 1361873
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 18 Vol. 146; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

The practical implementation of Löwdin's method for spin projection journal November 2018
Projected coupled cluster theory journal August 2017
Orbital-invariant spin-extended approximate coupled-cluster for multi-reference systems journal July 2018
Projected coupled cluster theory: Optimization of cluster amplitudes in the presence of symmetry projection journal October 2018
Polynomial-product states: A symmetry-projection-based factorization of the full coupled cluster wavefunction in terms of polynomials of double excitations journal April 2019

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