Entanglement entropy in an antiferromagnetic Heisenberg spin chain with boundary impurities
Jie Ren, Shiqun Zhu, Xiang Hao
The effects of boundary impurities on the entanglement entropy in an antiferromagnetic Heisenberg opened spin-1/2 chain are investigated. The method of the density-matrix renormalization group is used to obtain the bipartite entanglement. The entropy increases when the length of the subsystem increases. It approaches a constant when the system length is very large. With the same impurity interaction, qutrit impurities of spin-1 can increase the entanglement entropy.
arXiv:1006.1732•Journal of Physics B Atomic Molecular and Optical Physics•Dec 18, 2008•19 citations