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Home  >  volume 36 (no1)

Electron Correlation in the Two-Dimensional Hubbard Model at Low Filling: Perturbative Results Okanigbuan O.R, Idiodi J.O.A and Aghemenloh E. (Pages 223-230)
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The ground state energy, wave function and charge-Charge correlation function of the one-band Hubbard Hamiltonian for   lattices   at low fillings   are calculated using stationary perturbation theory. Our study reveals that there is a gradual increase in the ground state energy as the coulomb repulsion  increases. We check the validity of the perturbation expansion by making comparison with the correlated variational approach.