  Projected Hartree-Fock theory provides an accurate description of many kinds
of strong correlations but does not properly describe weakly-correlated
systems. On the other hand, single-reference methods such as configuration
interaction or coupled cluster theory can handle weakly-correlated problems but
cannot properly account for strong correlations. Ideally, we would like to
combine these approaches in a symmetry-projected coupled cluster approach, but
this is far from straightforward. In this work, we provide an alternative
formulation to identify the so-called disentangled cluster operators which
arise when we combine these two methodological strands. Our formulation shows
promising results for model systems and small molecules.

Strongly Correlated Electrons;Chemical Physics