BOSONIC MEAN-FIELD THEORY OF THE SPIRAL PHASES OF HEISENBERG ANTIFERROMAGNETS ON A CHAIN

被引：8
|
作者：
RAO, S
SEN, D
机构：
[1] INDIAN INST SCI,CTR THEORET STUDIES,BANGALORE 560012,KARNATAKA,INDIA
[2] INST PHYS,BHUBANESWAR 751005,INDIA
来源：
PHYSICAL REVIEW B | 1993年 / 48卷 / 17期
关键词：
D O I：
10.1103/PhysRevB.48.12763
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We develop a bosonic mean-field theory to describe the spiral phases of a Heisenberg antiferromagnet on a one-dimensional chain, in terms of three bosons at each site. The ground state is disordered, and for large values of the spin S, two different and exponentially small energy gaps are found. The spin-spin correlation function is computed and is shown to decay exponentially at large distances. Our mean-field theory is also shown to be exact in a large-N generalization.
引用
收藏
页码：12763 / 12767
页数：5
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