Entanglement in the Majumdar-Ghosh model

被引：38
作者：
Chhajlany, Ravindra W.
Tomczak, Piotr
Wojcik, Antoni
Richer, Johannes
机构：
[1] Adam Mickiewicz Univ, Dept Phys, PL-61614 Poznan, Poland
[2] Univ Magdeburg, Inst Theoret Phys, D-39016 Magdeburg, Germany
来源：
PHYSICAL REVIEW A | 2007年 / 75卷 / 03期
关键词：
D O I：
10.1103/PhysRevA.75.032340
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We present an analysis of the entanglement characteristics in the Majumdar-Ghosh (MG) or J(1)-J(2) Heisenberg model. For a system consisting of up to 28 spins, there is a deviation from the scaling behavior of the entanglement entropy characterizing the unfrustrated Heisenberg chain above J(2)approximate to 0.25. This feature can be used as an indicator of the dimer phase transition occurring in this model. Additionally, we also consider entanglement at the MG point J(2)=0.5J(1).
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