期刊论文

Huang, H. L.

英文

Solid State Communications

0038-1098

2014

185

30-34

10.1016/j.ssc.2014.01.017

In this paper, we have studied the bipartite correlation in a 2D Ising–Heisenberg spin model. We have used the Bell inequality to investigate the nonlocality between the two adjacent Heisenberg spins of the system. Firstly, Bell function captures the signals for both the quantum phase transition and thermal phase transitions of the model. As we have shown, the entanglement concurrence vanishes in some region, thus fails to detect the FM–PM transition. We would like to mention that quantum

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In this paper, we use the Bell inequality to study the bipartite correlation in an exactly soluble two-dimensional Ising-Heisenberg spin system. The Bell inequality can detect not only the quantum phase transition, but also the thermal phase transitions, or the system. The property or bipartite correlation in the system is also analyzed. In the quantum anti-ferromagnetic phase, the Bell inequality is violated thus nonlocality is present. It is interesting that the nonlocality is enhanced by thermal fluctuation, and similar results have not been observed in anti-ferromagnetic phases. In the fer...