Series expansions for excited states of quantum lattice models

被引：81

作者：

Gelfand, MP

机构：

[1] Department of Physics, Colorado State University, Fort Collins

来源：

SOLID STATE COMMUNICATIONS | 1996年 / 98卷 / 01期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0038-1098(96)00051-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We show that by means of connected-graph expansions one can effectively generate exact high-order series expansions which are informative of low-lying excited states for quantum many-body systems defined on a lattice. In particular, the Fourier series coefficients of elementary excitation spectra are directly obtained. The numerical calculations involved are straightforward extensions of those which have already been used to calculate series expansions for ground-state correlations and T = 0 susceptibilities in a wide variety of models.

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页码：11 / 14

页数：4

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