Luttinger-liquid behavior and superconducting correlations in t-J ladders

被引:81
作者
Hayward, CA
Poilblanc, D
机构
[1] Laboratoire de Physique Quantique, Université Paul Sabatier
来源
PHYSICAL REVIEW B | 1996年 / 53卷 / 17期
关键词
D O I
10.1103/PhysRevB.53.11721
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The low-energy behavior of the isotropic t-J ladder system is investigated using exact diagonalization techniques, specifically finding the Drude weight, the charge velocity, and the compressibility. By applying the ideas of Luttinger-liquid theory, we determine the correlation exponent K-p which defines the behavior of the long-range correlations in the system. The boundary to phase separation is determined and a phase diagram is presented. At low electron density, a Tomonaga-Luttinger-like phase is stabilized while at higher electron densities a gapped phase with power law pairing correlations is stabilized: A large region of this gapped phase is found to exhibit dominant superconducting correlations.
引用
收藏
页码:11721 / 11728
页数:8
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