Entanglement in a two-qubit Heisenberg XXZ chain with different Dzyaloshinskii-Moriya couplings and an inhomogeneous magnetic field

中国物理C, 2010, 34(11): 1693-1695.

^1, , ^2, , ^3, , ^4, , ^5,

1.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

2.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

3.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

4.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

5.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

基金项目: Pre-Research Foundation of PLA University of Science and Technology(2009JC02)

Entanglement in a two-qubit Heisenberg XXZ chain with different Dzyaloshinskii-Moriya couplings and an inhomogeneous magnetic field

QIN Meng ^1, , LI Yan-Biao ^2, , BAI Zhong ^3, , LIN Shang-Jin ^4, , LIU Wei ^5,

1.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

2.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

3.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

4.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

5.Institute of Science, PLA University of Science and Technology, Nanjing 211101, China

Keywords： entanglement

Ground state entanglement and thermal entanglement of a two-qubit Heisenberg XXZ chain in the presence of the different Dzyaloshinski-Moriya interaction and inhomogeneous magnetic field are investigated.By the concept of concurrence, we find that the inhomogeneity of the magnetic field may make entanglement last for a long time and the critical temperature is dependent on Jz and b. The entanglement can be increased by increasing the temperature in some cases. We also find that the x-component parameter Dx has a higher critical temperature and more entanglement for a certain condition than the z-component parameter Dz.

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