Chinese Journal of Quantum Electronics, Volume. 35, Issue 4, 444(2018)
Thermal entanglement in Heisenberg chain with Dzyaloshinski-Moriya interaction in external magnetic fields
Influences of the Dzyaloshinskii-Moriya(DM) coupling constant D, temperature T, uniform external magnetic field B, nonuniform magnetic field b, real coupling constant J and anisotropic parameter Δ on the thermal entanglement concurrence C are investigated in detail. Results show that both the increasing of T and B decrease C, but the increasing of D develops C, and D can also heighten the magnetic field threshold Bt. When B is bigger or less than Bt, b has different influence on C. By comparison, it is found that the B and b have different effects on the area about J and Δ (JΔ>0) where exists thermal entanglement as well as on C. What’s more, as T increases, the variation rule of the range of B in which exists thermal entanglement is different from b. As a result, the thermal entanglement can be controlled by adjusting the values of B, b, J, D, T and Δ in various terrible environments, such as strong external magnetic field, or high temperature environment, which is useful in the research of quantum information in solid systems.
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HUANG Liyuan, FANG Maofa. Thermal entanglement in Heisenberg chain with Dzyaloshinski-Moriya interaction in external magnetic fields[J]. Chinese Journal of Quantum Electronics, 2018, 35(4): 444
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Received: May. 15, 2017
Accepted: --
Published Online: Aug. 24, 2018
The Author Email: Liyuan HUANG (lyhuang@xujc.com)