A simple linear analytic method for Brillouin zone integration of spectral functions in the complex energy plane

A simple linear analytic method for Brillouin zone integration of spectral functions in the complex energy plane
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复能面谱函数布里渊区积分的简单线性解析方法

DOI:
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发表时间:
1986
期刊:
影响因子:
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通讯作者:
P. E. Mijnarends
P. E. Mijnarends
中科院分区:
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文献类型:
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作者:
S. Kaprzyk;P. E. Mijnarends

文献摘要

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给出了分析四面体方法的推广,该方法允许评估整个复杂能量平面上的谱函数。矩阵元素和色散关系的线性插值产生紧凑且透明的公式,该公式没有奇点并且非常适合自动计算。给出了简单立方晶格的晶格格林函数 G(E) 的说明性计算,其中 Im E=0.001 和 0.1。
A generalisation of the analytical tetrahedron method is given which allows the evaluation of spectral functions over the entire complex energy plane. Linear interpolation of both the matrix element and the dispersion relations leads to compact and transparent formulae which are free of singularities and well suited for automatic computation. An illustrative calculation is presented of the lattice Green function G(E) for the simple cubic lattice for Im E=0.001 and 0.1.