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arXiv 1012.5478quant-phcond-mat.str-el
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三角Kagome晶格的磁性和热纠缠

Magnetic Properties and Thermal Entanglement on a Triangulated Kagome Lattice

N. S. Ananikian, L. N. Ananikyan, L. A. Chakhmakhchyan, A. N. Kocharian

摘要:

利用基于Gibbs-Bogoliubov不等式的类变分平均场处理方法,分析了三角Kagome晶格上自旋为1/2的Ising-Heisenberg模型的磁性和纠缠热平衡性质.由于海森堡三聚体之间的伊辛型交换相互作用具有可分离的性质,因此可以对每个三聚体分别计算自洽场中的量子纠缠。即使在没有磁场的情况下,三量子比特各向同性海森堡模型在有效伊辛场中的纠缠度也是非零的。磁性和纠缠特性表现出共同的(平台和峰值)功能,可通过(反铁磁)耦合常数和外部磁场。在量子位之间存在反铁磁耦合的情况下,相变的临界温度和共存的阈值温度是一致的。在饱和相和阻挫相中存在纠缠相和非纠缠相。

英文摘要:

The magnetic and entanglement thermal (equilibrium) properties in spin-1/2 Ising-Heisenberg model on a triangulated Kagome lattice are analyzed by means of variational mean-field like treatment based on Gibbs-Bogoliubov inequality. Because of the separable character of Ising-type exchange interactions between the Heisenberg trimers the calculation of quantum entanglement in a self-consistent field can be performed for each of the trimers individually. The concurrence in terms of three qubit isotropic Heisenberg model in effective Ising field is non-zero even in the absence of a magnetic field. The magnetic and entanglement properties exhibit common (plateau and peak) features observable via (antferromagnetic) coupling constant and external magnetic field. The critical temperature for the phase transition and threshold temperature for concurrence coincide in the case of antiferromagnetic coupling between qubits. The existence of entangled and disentangled phases in saturated and frustrated phases is established.

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