Charge fluctuations in the 2D Hubbard model

被引：2
|
作者：
Citro, R [1 ]
Di Matteo, S [1 ]
Marinaro, M [1 ]
机构：
[1] Univ Salerno, Dipartimento Sci Fis ER Caianiello, Salerno, Italy
来源：
PHYSICA C | 2000年 / 341卷
关键词：
D O I：
10.1016/S0921-4534(00)00464-0
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The charge susceptibility of the 2D Hubbard model is calculated by means of a Bethe-Salpeter equation within a cumulant expansion method. It is shown that in the considered approach an instability in the charge susceptibility appears and a new collective mode is generated. The energy spectrum of this excitation is evaluated numerically; and a gap is found at k = (0, 0) which is a function of the Coulomb repulsion U and the doping. For any fixed U a critical value of the doping x(c), at which the spectrum becomes gapless, can be determined.
引用
收藏
页码：249 / 250
页数：2
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