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New Comparisons for Local Quantities of the Two-Dimensional Hubbard Model

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.

preprint2002arXivOpen access
A. AvellaF. Mancini
cond-mat.str-el
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Open access2 authors1 topic
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A. AvellaF. Mancini

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