Spectral Functions of One-dimensional Models of Correlated Electrons

Details Spectral Functions of One-dimensional Models of Correlated Electrons Spectral Functions of One-dimensional Models of Correlated Electrons

1996-11-27

arxiv.org/abs/cond-mat/9611223v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 embedded encapsulated PostScript figures, to be published in Phys. Rev. B (RC)

Scientific paper

10.1103/PhysRevB.55.R4859

Using the Ogata-Shiba wave function, the spectral functions of the one-dimensional infinite U Hubbard model are calculated for various concentrations. It is shown that the ``shadow band'' feature due to 2k_F fluctuations becomes more intense close to half-filling. Comparing these results with exact diagonalization data obtained on finite clusters for the finite U Hubbard model and for the t-J model, it is also shown that this feature remains well-defined for physically reasonable values of the parameters (U/t\simeq 10, J/t\simeq 0.4). The ``shadow'' structure in the spectral functions should thus be observable in angle-resolved photoemission experiments for a variety of quasi-one dimensional compounds.

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