Spin gap of the one-dimensional t-J model

被引：0
|
作者：
Chen, YC [1 ]
机构：
[1] Tunghai Univ, Dept Phys, Taichung 407, Taiwan
来源：
PHYSICA C | 2001年 / 364卷
关键词：
spin gap; power-Lanczos method; t-J model;
D O I：
10.1016/S0921-4534(01)00725-0
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We carry out the numerical calculation of the low-energy behavior of the one-dimensional t-J model. The lowest singlet-triplet spin excitations are determined for various couplings J and densities n in the finite chain. The methods we employed in this study include the exact diagonalization for smaller lattice and power-Lanczos method for the larger lattice. The spin gap in the bulk limit is then obtained by finite-size extrapolation. We find the spin-gap region is more extensive in the phase diagram as indicated in the renormalization group analysis. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：113 / 116
页数：4
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