Anisotropy of the Energy Gap in the Insulating Phase of the U-t-t' Hubbard Model

Details Anisotropy of the Energy Gap in the Insulating Phase of the U-t-t' Hubbard Model Anisotropy of the Energy Gap in the Insulating Phase of the U-t-t' Hubbard Model

2000-01-14

arxiv.org/abs/cond-mat/0001210v2

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages Revtex, 6 embedded eps figures; Figures 5 and 6 were in error and have been replaced including the discussion of the f

Scientific paper

10.1007/s100510070054

We apply a diagrammatic expansion method around the atomic limit (U >> t) for the U-t-t' Hubbard model at half filling and finite temperature by means of a continued fraction representation of the one-particle Green's function. From the analysis of the spectral function A(\vec{k},\omega) we find an energy dispersion relation with a (cos k_x-cos k_y)^2 modulation of the energy gap in the insulating phase. This anisotropy is compared with experimental ARPES results on insulating cuprates.

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