CALCULATION OF THE SINGLET-TRIPLET GAP OF THE ANTIFERROMAGNETIC HEISENBERG-MODEL ON A LADDER

被引：59

作者：

AZZOUZ, M ^{[1
]}

CHEN, L ^{[1
]}

MOUKOURI, S ^{[1
]}

机构：

[1] UNIV SHERBROOKE,DEPT PHYS,SHERBROOKE J1K 2R1,QUEBEC,CANADA

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.50.6233

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The ground-state energy and the singlet-triplet energy pp of the antiferromagnetic Heisenberg model on a ladder is investigated using a mean-field theory and the density-matrix renormalization group. Spin-wave theory shows that the corrections to the local magnetization are infinite. This indicates that no long-range order occurs in this system. A flux-phase state is used to calculate the energy pp as a function of the transverse coupling, J(perpendicular-to), in the ladder. It is found that the gap is linear in J(perpendicular-to) for J(perpendicular-to) much greater than 1 and goes to zero for J(perpendicular-to) --> 0. The mean-field theory agrees well with the numerical results.

引用

页码：6233 / 6237

页数：5

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