科研之友
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摘要
We apply a diagrammatic expansion method around the atomic limit (U much greater than 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(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.
- 出版日期2000-11
