Abstract:
We apply a diagrammatic expansion method around the atomic limit () 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 we find an energy dispersion relation with a modulation of the energy gap in the insulating phase. This anisotropy is compared with experimental ARPES results on insulating cuprates.
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Received 18 May 2000 and Received in final form 9 August 2000
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Brune, P., Kampf, A. Anisotropy of the energy gap in the insulating phase of the U-t-t' Hubbard model. Eur. Phys. J. B 18, 241–245 (2000). https://doi.org/10.1007/s100510070054
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DOI: https://doi.org/10.1007/s100510070054