- Letter
Symmetry projection to coupled-cluster singles plus doubles wave function through the Monte Carlo method
Phys. Rev. C 104, L031305 – Published 22 September, 2021
DOI: https://doi.org/10.1103/PhysRevC.104.L031305
Abstract
A method for calculating the symmetry-projected energy of coupled-cluster singles plus doubles (CCSD) wave function through the Monte Carlo method is proposed. We present benchmark calculations in considering the three-level Lipkin model which is a simple and minimal model with two phases: spherical and deformed. It is demonstrated that this method gives good ground-state energy and low-lying spectra.
