Ground-state entanglement in the XXZ model

被引：98
|
作者：
Gu, SJ [1 ]
Tian, GS
Lin, HQ
机构：
[1] Chinese Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] Chinese Univ Hong Kong, Inst Theoret Phys, Hong Kong, Hong Kong, Peoples R China
[3] Peking Univ, Sch Phys, Beijing 100871, Peoples R China
来源：
PHYSICAL REVIEW A | 2005年 / 71卷 / 05期
关键词：
D O I：
10.1103/PhysRevA.71.052322
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
In this paper, we investigate spin entanglement in the XXZ model defined on a d-dimensional bipartite lattice. The concurrence, a measure of the entanglement between two spins, is analyzed. We prove rigorously that the ground-state concurrence reaches maximum at the isotropic point. For dimensionality d >= 2, the concurrence develops a cusp at the isotropic point and we attribute it to the existence of magnetic long-range order.
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页数：5
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