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Density-Matrix Renormalization-Group Study of the Entanglement andEntropy in Antiferromagnetic Heisenberg Spin Chain with Domain Walls
Ren Jie *,Zhu Shiqun
School of Physical Science and Technology, Suzhou University
*Correspondence author
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Funding: 国家自然科学基金,教育部博士点基金（No.10774108,20050285002）
Opened online:10 September 2008
Accepted by: none
Citation: Ren Jie ,Zhu Shiqun .Density-Matrix Renormalization-Group Study of the Entanglement andEntropy in Antiferromagnetic Heisenberg Spin Chain with Domain Walls[OL]. [10 September 2008] http://en.paper.edu.cn/en_releasepaper/content/23932
 
 
By using the method of density-matrix renormalization-group theory, the ground state entanglement in the spin$-1/2$ isotropic antiferromagnetic Heisenberg chain is studied when there are domain walls generated by a boundary magnetic field. It is found that the pairwise entanglement of odd-bond two qubits decreases and even-bond two qubits increases to stable values alternately when the magnetic field increases. The pairwise entanglement of odd-bond can equal to that of even-bond for a suitable value of the magnetic field. When the magnetic field increases further, the entanglement of even-bond can be larger than that of odd-bond. The entanglement entropy increases and then almost saturates as the number of spin sites increases. Due to the domain walls, the entanglement entropy of even-bond decreases to a minimum value and then increases as the magnetic field increases.
Keywords:DMRG;entropy;entanglement
 
 
 

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