2-DIMENSIONAL NEGATIVE-U HUBBARD-MODEL

被引：201

作者：

MOREO, A

SCALAPINO, DJ

机构：

[1] Department of Physics, University of California, Santa Barbara

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 66卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.66.946

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Quantum Monte Carlo simulations are used to explore the phase diagram of the negative-U Hubbard model. As the system is doped away from half filling, <n> = 1, the s-wave pair-field correlations are enhanced and the charge-density-wave correlations suppressed. There is no indication of phase separation. Away from half filling, the pair-field correlations are consistent with Kosterlitz-Thouless scaling and a finite T(c) which peaks near <n> = 1 but vanishes at exactly half filling.

引用

页码：946 / 948

页数：3

共 8 条

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