The spectral weight of the Hubbard model through cluster perturbation theory

Details The spectral weight of the Hubbard model through cluster perturbation theory The spectral weight of the Hubbard model through cluster perturbation theory

1999-08-03

arxiv.org/abs/cond-mat/9908045v1

Phys. Rev. Lett. 84 (2000) 522.

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.84.522

We calculate the spectral weight of the one- and two-dimensional Hubbard models, by performing exact diagonalizations of finite clusters and treating inter-cluster hopping with perturbation theory. Even with relatively modest clusters (e.g. 12 sites), the spectra thus obtained give an accurate description of the exact results. Thus, spin-charge separation (i.e. an extended spectral weight bounded by singularities) is clearly recognized in the one-dimensional Hubbard model, and so is extended spectral weight in the two-dimensional Hubbard model.

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