VARIATIONAL APPROACHES TO THE NEGATIVE-U HUBBARD-MODEL FOR ARBITRARY BANDFILLINGS

被引：0
|
作者：
FLEDDERJOHANN, A
WEBER, W
机构：
[1] Institut für Physik, Universität Dortmund, Dortmund, D-44221, Otto-Hahn-Strasse
来源：
ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1993年 / 92卷 / 02期
关键词：
D O I：
10.1007/BF01312173
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Results of several variational approaches to the negative-U Hubbard model away from halffilling are presented. The approaches include charge ordered and BCS variational states as well as the Gutzwiller approximation. No evidence for a charge density wave state has been observed.
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页码：173 / 178
页数：6
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