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
复制标题
U-t-t Hubbard 模型绝缘相能隙的各向异性
DOI：
10.1007/s100510070054
复制
发表时间：
2000
期刊：
影响因子：
--
通讯作者：
A. P. Kampf
中科院分区：
文献类型：
--
作者：
Philipp Brune;A. P. Kampf
对于U-t-t‘Hubbard模型，在半填充和有限温度下，我们对原子极限(文件类[12pt]{Minimum}\usepackage{amsath}\usepackage{wa ysym}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathsfs}\usepackage{upgreek}\setlong{\oddsidemargin}{-69pt}\Begin{Document}\end{Document})应用图解展开方法单粒子格林函数的连分式表示。通过对谱函数的分析，我们发现了一个能量弥散关系，即能量弥散关系为：}\usepackage{wa ysym}\usepackage{amsFonts}\usepackage{amssymb}\usepackage{amsbsy}\usepackage{mathrsfs}\usepackage{upgreek}\setlong{\oddsidemargin}{-69pt}\Begin{Document}\end{Document}调制绝缘相中的能隙。将这种各向异性与绝缘铜酸盐的ARPES实验结果进行了比较。
We apply a diagrammatic expansion method around the atomic limit (\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document}) for theU-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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document} we find an energy dispersion relation with a \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}\end{document} modulation of the energy gap in the insulating phase. This anisotropy is compared with experimental ARPES results on insulating cuprates.