Near-exact treatment of seniority-zero ground and excited states with a Richardson-Gaudin mean-field

Charles-Émile Fecteau, Samuel Cloutier, Jean-David Moisset +4

Eigenvectors of the reduced Bardeen-Cooper-Schrieffer Hamiltonian, Richardson-Gaudin (RG) states, are used as a variational wavefunction Ansatz for strongly-correlated electronic s…