Entanglement in an anisotropic spin-1 Heisenberg chain

• 来源期刊: 中国物理（英文版）
• 关键词: entanglement Heisenberg chain open boundary condition periodic boundary condition
• 年，卷（期）: 2007,（8）
• 页码范围: 2229-2236
• 页数: 8页
• 语种: 英文

摘要

The entanglement in an anisotropic spin-1 Heisenberg chain with a uniform magnetic field is investigated. The ground-state entanglement will undergo two different kinds of transitions when the anisotropy △ and the amplitude of the magnetic field B are varied. The thermal entanglement of the nearest neighbour always declines when B increases no matter what the value of the anisotropy is. It is very interesting to note that the entanglement of the next-nearest neighbour can increase to a maximum at a certain magnetic field. Regardless of the boundary condition, the nearest-neighbour entanglement always decreases and approaches to a constant value when the size of the system is very large. The constant value of open boundary condition is much larger than that of periodic boundary condition.