Spectral Weight of the Hubbard Model through Cluster Perturbation Theory

1999/08/03 by D. Senechal, David Sénéchal, Danny Perez +3 · 18 citations
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Strong Light-Matter Interactions #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.84.522

published as Phys. Rev. Lett. 84 (2000) 522. · 4 pages, 5 figures

arxiv created 1999/08/03 · openalex publication_date 2000/01/17 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We calculate the spectral weight of the one- and two-dimensional Hubbard models by performing exact diagonalizations of finite clusters and treating intercluster 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. Spin-charge separation (i.e., an extended spectral weight bounded by singularities dispersing with wave vector) is clearly recognized in the one-dimensional Hubbard model, and so is extended spectral weight in the two-dimensional Hubbard model.

Citations

• Electron correlations in narrow energy bands

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