Anisotropy of the energy gap in the insulating phase of the U-t-t′ Hubbard model

被引：3

作者：

Brune, P ^{[1
]}

Kampf, AP ^{[1
]}

机构：

[1] Univ Augsburg, Inst Phys Theoret Phys 3, D-86135 Augsburg, Germany

来源：

EUROPEAN PHYSICAL JOURNAL B | 2000年 / 18卷 / 02期

关键词：

D O I：

10.1007/s100510070054

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

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.

引用

页码：241 / 245

页数：5

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