New Comparisons for Local Quantities of the Two-Dimensional Hubbard Model
arXiv:cond-mat/0209673 · doi:10.1142/S0217979203016224
Abstract
We have compared the results of our approximation scheme, the composite operator method, for the double occupancy and the internal energy of the two-dimensional Hubbard model with numerical data obtained by means of the Lanczos and quantum Monte Carlo schemes. The agreement is very good at both half-filling and away from it showing how reliable is the approximation scheme.
6 pages, 3 figures