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The Thermal Entanglement in a Spin-1 Heisenberg XXZ Chain

机译:旋转1 Heisenberg XXZ链中的热缠绕

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In this paper, the entanglement in a spin-1 Heisenberg XXZ chain with uniform and nonuniform external magnetic field is investigated in the terms of the measure of entanglement called 'negativity'. The effects of the external magnetic field, the anisotropy parameter and the temperature on the negativity are discussed respectively. It can be seen that the entanglement in this spin chain for any temperature is symmetric with respect to zero magnetic field. We calculate the partially transposed density matrix and give qualitatively results at different temperatures. In order to show the results clearly, the behavior of negativity is presented for five different cases. It can be found that the temperature and the external magnetic field can effect the feature of the thermal entanglement significantly. In addition, under certain condition, the negativity may be enhanced under a nonuniform magnetic field.
机译:在本文中,在称为“消极性”的缠结度量方面,研究了具有均匀和非均匀外部磁场的Spin-1 Heisenberg XXZ链中的缠结。讨论了外部磁场,各向异性参数和对消极性温度的影响。可以看出,对于任何温度的这种旋转链中的缠结相对于零磁场对称。我们计算部分转置的密度矩阵,并在不同温度下进行定性结果。为了清楚地表明结果,呈现消极性的行为为五种不同的情况。可以发现,温度和外部磁场可以显着影响热缠结的特征。另外,在某些情况下,在非均匀磁场下可以增强消极性。

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