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Thermal Entanglement in Spin-Dimer V4+ with a Strong Magnetic Field |
| ZHANG Guo-Feng1,2;LIANG Jiu-Qing1;YAN Qi-Wei2 |
| 1Institute of Theoretical Physics, Shanxi University, Taiyuan 030006
2Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080 |
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| Cite this article: |
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ZHANG Guo-Feng, LIANG Jiu-Qing, YAN Qi-Wei 2003 Chin. Phys. Lett. 20 452-455 |
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Abstract We study the entanglement in Heisenberg dimer single molecular magnets V4+ with a strong magnetic field by means of the measure of entanglement called “concurrence”and find that thermal entanglement exists for both the ferromagnetic (FM) and antiferromagnetic (AFM) cases. In the FM case, entanglement vanishes for anisotropic parameter λ = 0 while in the AFM case, entanglement exits in the whole region of anisotropic parameter 0 ≤ λ ≤ 1. Entanglement variations with anisotropic parameter λ, magnetic field B and temperature T are evaluated. We find a critical magnetic field at which the concurrence changes sharply from zero to maximum entanglement.
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| Keywords:
03.65.Ud
75.10.Jm
05.50.+q
03.67.Lx
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Published: 01 April 2003
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| PACS: |
03.65.Ud
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(Entanglement and quantum nonlocality)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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05.50.+q
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(Lattice theory and statistics)
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03.67.Lx
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(Quantum computation architectures and implementations)
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