摘要
We investigate the effects of the directions of Dzyaloshinskii Moriya （DM） interaction and magnetic field on the thermal entanglement in the pure DM model. It is found that when the Hamiltonian is H1 = D. （σ1 ＋σ2） ＋B.σ1, the entanglement can reach its maximum if the directions of the magnetic field and the DM vector are parallel. In addition, when the Hamiltonian is H2 = D @ （σ1 σ2） ＋ B. （σ1 ＋ σ2）, if the directions of the magnetic field and the DM vector are perpendicular in a high magnetic field, or their directions are parMlel in a weak magnetic field, the entanglement can also reach its maximum. Thus the entanglement can be enhanced by adjusting the direction of the external magnetic field, and this is feasible within the current experimental technology.
We investigate the effects of the directions of Dzyaloshinskii Moriya （DM） interaction and magnetic field on the thermal entanglement in the pure DM model. It is found that when the Hamiltonian is H1 = D. （σ1 ＋σ2） ＋B.σ1, the entanglement can reach its maximum if the directions of the magnetic field and the DM vector are parallel. In addition, when the Hamiltonian is H2 = D @ （σ1 σ2） ＋ B. （σ1 ＋ σ2）, if the directions of the magnetic field and the DM vector are perpendicular in a high magnetic field, or their directions are parMlel in a weak magnetic field, the entanglement can also reach its maximum. Thus the entanglement can be enhanced by adjusting the direction of the external magnetic field, and this is feasible within the current experimental technology.
基金
Supported by the National Natural Science Foundation of China under Grant Nos 11204061,11374085,11274010 and 11204002
the Anhui Provincial Natural Science Foundation under Grant No 1408085MA16
the China Postdoctoral Science Foundation under Grant No 20110490825
the Key Project of the Ministry of Education of China under Grant No 211080
the Key Program of the Education Department of Anhui Province under Grant Nos KJ2012A244 and KJ2012A020
the Program of Hefei Normal University under Grant Nos 2012jd17,2013jd03 and 2014136KJC02
the Excellent Young Talents Support Plan of Anhui Provincial Universities
作者简介
Corresponding author. Email： dachuangli@ustc.edu.cn
