ENERGY-GAP OF THE S=1 ANTIFERROMAGNETIC HEISENBERG CHAIN

被引：93

作者：

SAKAI, T

TAKAHASHI, M

机构：

[1] Institute for Solid State Physics, University of Tokyo, Roppongi, Minato-ku

来源：

PHYSICAL REVIEW B | 1990年 / 42卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.42.1090

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The S=1 isotropic antiferromagnetic Heisenberg chain is studied by exact diagonalizations using the Lanczös algorithm. Energy gaps, structure factors at k, and staggered susceptibilities at T=0 are calculated for finite rings up to N=16, and extrapolated to an infinite system using Shanks transformation. The estimated energy gap is 0.411 0.001, which agrees with the result of Monte Carlo calculations by Nightingale and Blöte. Further, it is found that a finite-size correction decays exponentially and the decay constant corresponds with the correlation length, which is about 5. © 1990 The American Physical Society.

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页码：1090 / 1092

页数：3

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