New Comparisons for Local Quantities of the Two-Dimensional Hubbard Model
A. Avella, F. Mancini
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.
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