PAIRING AND CHARGE-DENSITY-WAVE CORRELATIONS IN THE HOLSTEIN MODEL AT HALF-FILLING

被引：88
|
作者：
MARSIGLIO, F
机构：
[1] Department of Physics, University of California at San Diego, San Diego
来源：
PHYSICAL REVIEW B | 1990年 / 42卷 / 04期
关键词：
D O I：
10.1103/PhysRevB.42.2416
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We study the two-dimensional Holstein model at half-filling for small systems using quantum Monte Carlo methods and through diagrammatic perturbation techniques in the Migdal-Eliashberg approximation. It is found that the latter approximation is very accurate as long as the phonon self-energy is taken into account in a self-consistent way. Vertex corrections are not required. © 1990 The American Physical Society.
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收藏
页码：2416 / 2424
页数：9
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