Correlation between perturbation and variation methods in the study of strongly correlated electron systems

  • RO Okanigbuan
  • JO Idiodi

Abstract



The ground–state wave function and energy are calculated for two electrons subject to a one-band Hubbard Hamiltonian on a one dimensional lattice containing N electronic sites, N = 2,3,4,5,6, and a 3 x 3 cluster of the square lattice, using perturbation and variational methods. The results from these two approximation methods are then compared with the result from exact calculational method.

Journal of the Nigerian Association of Mathematical Physics Vol. 10 2006: pp. 583-594
Published
2008-05-22
Section
Articles

Journal Identifiers


eISSN: 1116-4336