LARGE-N EXPANSION FOR FRUSTRATED QUANTUM ANTIFERROMAGNETS

被引：740
|
作者：
READ, N [1 ]
SACHDEV, S [1 ]
机构：
[1] YALE UNIV,CTR THEORET PHYS,NEW HAVEN,CT 06520
来源：
PHYSICAL REVIEW LETTERS | 1991年 / 66卷 / 13期
关键词：
D O I：
10.1103/PhysRevLett.66.1773
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A large-N expansion technique based on symplectic [Sp(N)] symmetry for frustrated magnetic systems is proposed and applied to the square-lattice quantum antiferromagnet with first-, second-, and third-neighbor antiferromagnetic coupling. In addition to disordered states similar to those in unfrustrated systems, phases with incommensurate coplanar spin correlations and unconfined bosonic spinons are found. The occurrence of "order from disorder" is discussed. Neither chirally ordered nor spin-nematic states are found.
引用
收藏
页码：1773 / 1776
页数：4
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