Entanglement in the XY Heisenberg model

被引：3

作者：

Xin, T ^{[1
]}

Lin, JT ^{[1
]}

Liang, L ^{[1
]}

De-Long, R ^{[1
]}

机构：

[1] Tianjin Univ, Dept Appl Phys, Tianjin 300072, Peoples R China

来源：

MODERN PHYSICS LETTERS B | 2004年 / 18卷 / 19-20期

关键词：

Heisenberg XY model; entanglement;

D O I：

10.1142/S021798490400761X

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We investigate the thermal entanglement of two-qubit anisotropic Heisenberg XY model in the presence of an external nonuniform magnetic field B along the z-axis. Concurrence, the measure of entanglement is calculated and its property is studied in different cases. Two best models, Ising model under a uniform magnetic and isotropic model in a nonuniform magnetic field, are discovered. In the two models, the critical temperature T-c (above which there is no entanglement) can be enhanced and its concurrence is maximal.

引用

页码：1059 / 1065

页数：7

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