Entanglement Entropy in an Antiferromagnetic Heisenberg Spin Chain with Boundary Impurities

Abstract

The effects of boundary impurities on the entanglement entropy in an antiferromagnetic Heisenberg opened spin-$1/2$ chain are investigated. The method of density-matrix renormalization-group is used to obtain the bipartite entanglement. The entropy increases when the length of the subsystem increases. It will approach to a constant when system length is very large. With the same impurity interaction, qutrit impurities of spin-$1$ can increase the entanglement entropy.

12 pages, 4 figures

References in corpus (3)

• Entropic analysis of quantum phase transitions from uniform to spatially inhomogeneous phases
• Logarithmic delocalization of end spins in the S=3/2 antiferromagnetic Heisenberg chain
• Numerical estimation of critical parameters using the Bond entropy

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• Phase diagram of the spin-1/2 Heisenberg alternating chain in a magnetic field
• Rényi entropies for one-dimensional quantum systems with mixed boundary conditions
• Second Rényi entropy and annulus partition function for one-dimensional quantum critical systems with boundaries