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Anisotropy of the energy gap in the insulating phase of the U-t-t' Hubbard model |
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| Authors: | Ph. Brune A.P. Kampf |
| Affiliation: | Institut für Physik, Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universit?t Augsburg, 86135 Augsburg, Germany, DE |
| 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. Received 18 May 2000 and Received in final form 9 August 2000 |
| Keywords: | PACS. 71.10.Fd Lattice fermion models (Hubbard model, etc.) - 71.27.+a Strongly correlated electron systems heavy fermions - 71.30.+h Metal-insulator transitions and other electronic transitions |
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