SPIN GAP OF THE ONE-DIMENSIONAL T-J-J' MODEL

被引：9

作者：

SANO, K ^{[1
]}

TAKANO, K ^{[1
]}

机构：

[1] TOYOTA TECHNOL INST, TENPAKU KU, NAGOYA 468, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1993年 / 62卷 / 11期

关键词：

D O I：

10.1143/JPSJ.62.3809

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the one-dimensional t-J-J' model by the numerical diagonalization where a few holes are doped in the half-filled band. By introducing a finite-size scaling, we estimate the spin gap at J'/J = 0.5 and J/t = 2. When one hole is doped, the spin gap decreases to 0.190 J in comparison with 0.236 J which is the spin gap of the half-filled band. The spin gap further reduces to 0.141 J for two-hole doping and to about 0.05 J for three-hole doping. This result shows that the value of the spin gap as a function of the electron density is discontinuous at half-filling.

引用

页码：3809 / 3812

页数：4

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