Ground-State and Thermal Entanglement in Three-Spin Heisenberg-XXZ Chain with Three-Spin Interaction
Ground-State and Thermal Entanglement in Three-Spin Heisenberg-XXZ Chain with Three-Spin Interaction
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DOI：
10.1088/0253-6102/48/2/010
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发表时间：
2007-08
影响因子：
3.1
通讯作者：
Zhang Yong;Long Gui-lu
中科院分区：
文献类型：
--
作者：
Zhang Yong;Long Gui-lu
利用两两纠缠的纠缠度研究了具有三自旋相互作用的XXZ海森堡链的纠缠特性。我们证明了在反铁磁自旋链中不存在基态两两纠缠、两两热纠缠和量子相变。对于铁磁情况，在各向异性相互作用下，在Δ = 1处发生量子相变，在一定的三自旋耦合强度下，两两热纠缠随J/T的增大而增大，随各向异性相互作用和三自旋相互作用的减小而减小.另外，我们发现各向异性相互作用和三自旋相互作用的增加会降低临界温度。
The entanglement properties of a three-spin XXZ Heisenberg chain with three-spin interaction are studied by means of concurrence of pairwise entanglement. We show that ground-state pairwise entanglement, pairwise thermal entanglement, or quantum phase transition is not present in antiferromagnetic spin chain. For the ferromagnetic case, quantum phase transition takes place at Δ = 1 for anisotropic interaction and at some values of three-spin coupling strength, and pairwise thermal entanglement increases when the value of J/T increases and with anisotropic interaction and three-spin interaction decrease. In addition, we find that increasing the anisotropic interaction and the three-spin interaction will decrease critical temperature.