Nearest-Neighbor Correlations in Hubbard Model
Strongly Correlated Electrons
2009-10-30 v2
Abstract
The Hubbard Hamiltonian is investigated by means of a variational trial wave function of Gutzwiller's type. The wave function includes nearest - neighbor correlations in an explicit form. To calculate density matrices the method of Kikuchi's pseudoensemble is used. The case of half-filled fermionic band carefully investigated in the limit of a large number of lattice sites. The ground state energy and correlation functions are determined for lattices with z=2,4 and 6 nearest neighbors.
Cite
@article{arxiv.cond-mat/9712023,
title = {Nearest-Neighbor Correlations in Hubbard Model},
author = {Yu. B. Kudasov},
journal= {arXiv preprint arXiv:cond-mat/9712023},
year = {2009}
}
Comments
minor revisions (additional figure, fig2 is redrawn, et al.) 8 pages, 3 Post Script figures, RevTex; accepted to Phys.Lett.A