The half-filled Hubbard chain in the Composite Operator Method: A comparison with Bethe Ansatz

Details The half-filled Hubbard chain in the Composite Operator Method: A comparison with Bethe Ansatz The half-filled Hubbard chain in the Composite Operator Method: A comparison with Bethe Ansatz

1998-07-28

arxiv.org/abs/cond-mat/9807368v1

Europhys. Lett. 44, 328 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 embedded Postscript figures, EuroTeX, submitted to EuroPhysics Letters

Scientific paper

10.1209/epl/i1998-00478-8

The one-dimensional Hubbard model at half-filling is studied in the framework of the Composite Operator Method using a static approximation. A solution characterized by strong antiferromagnetic correlations and a gap for any nonzero on-site interaction U is found. The corresponding ground-state energy, double occupancy and specific heat are in excellent agreement with those obtained within the Bethe Ansatz. These results show that the Composite Operator Method is an appropriate framework for the half-filled Hubbard chain and can be applied to evaluate properties, like the correlation functions, which cannot be obtained by means of the Bethe Ansatz, except for some limiting cases.

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