Chin. Phys. Lett.  2015, Vol. 32 Issue (5): 050302    DOI: 10.1088/0256-307X/32/5/050302
GENERAL |
Thermal Entanglement in the Pure Dzyaloshinskii–Moriya Model with Magnetic Field
LI Da-Chuang1,2,3**, LI Xiao-Man1,2, LI Hu1,2, TAO Rui1, YANG Ming2, CAO Zhuo-Liang1,2
1School of Electronic and Information Engineering, Hefei Normal University, Hefei 230601
2School of Physics and Material Science, Anhui University, Hefei 230039
3Hefei National Laboratory for Physical Sciences at the Microscale and Department of Modern Physics, University of Science and Technology of China, Hefei 230026
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LI Da-Chuang, LI Xiao-Man, LI Hu et al  2015 Chin. Phys. Lett. 32 050302
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Abstract

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 parallel 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.
Received: 14 February 2015      Published: 01 June 2015
PACS:  03.67.Lx (Quantum computation architectures and implementations)  
  03.65.Ud (Entanglement and quantum nonlocality)  
  75.10.Jm (Quantized spin models, including quantum spin frustration)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/32/5/050302       OR      https://cpl.iphy.ac.cn/Y2015/V32/I5/050302
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LI Da-Chuang
LI Xiao-Man
LI Hu
TAO Rui
YANG Ming
CAO Zhuo-Liang

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