摘要
We investigate the thermal entanglement in the Lipkin-Meshkov-G1ick （LMG） model which consists of spin-1/2 particles with XXZ-type exchange interactions between any pair of them. The ferromagnetic （FM） and antiferromagnetic （AFM） cases are completely analyzed at both finite temperature and zero temperature. According to the results obtained by accurate numerical calculation, several interesting physic phenomena and characteristics of thermal entanglement in the LMG model are found. Not only do we evaluate the entanglement of the LMG model, but also discover the correlations between macroscopic physical quantities and thermal entanglement.
基金
Supported by the National Natural Science Foundation of China under Grant No. 11004028
the Science and Technology Foundation of Southeast University under Grant No. KJ2010417
the Teaching and Research Foundation for the Outstanding Young Faculty of Southeast University
