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
- Rice Univ., Houston, TX (United States). Department of Chemistry; Department of Chemistry, Rice University, Houston, Texas 77005-1892, USA
- 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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