Entanglement entropy in an antiferromagnetic Heisenberg spin chain with boundary impurities

摘要

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.