Symmetry projection to coupled-cluster singles and doubles wave function through the Monte Carlo method
arXiv:2103.00120 · doi:10.1103/PhysRevC.104.L031305
Abstract
A new method for calculating the symmetry-projected energy of coupled-cluster singles and 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 ones. It is demonstrated that this new method gives good ground state energy and low-lying spectra.
6 pages, 4 figures, submitted to PRC
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