Negativity in the Extended Hubbard Model under External Magnetic Field

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2008,（1）
• 页码范围: 31-34
• 页数: 4页
• 语种: 英文

摘要

We exactly calculate the negativity,a measurement of entanglement,in the two-site extended Hubbard model with external magnetic field.Its behaviour at different temperatures is presented.The negativity reduces with the increasing temperature or with the increasing uniform external magnetic field.It is also found that a non-uniform external magnetic field can be used to modulate or to increase the negativity.