The proposed method calculates the symmetry-projected energy of CCSD wave function through the Monte Carlo method and shows good results in benchmark calculations of the three-level Lipkin model.
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.
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