Critical entanglement of XXZ Heisenberg chains with defects

Details Critical entanglement of XXZ Heisenberg chains with defects Critical entanglement of XXZ Heisenberg chains with defects

2005-09-13

arxiv.org/abs/cond-mat/0509338v1

Phys. Rev. B 73, 024417 (2006)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 15 figures

Scientific paper

10.1103/PhysRevB.73.024417

We study the entanglement properties of anisotropic open spin one-half Heisenberg chains with a modified central bond. The entanglement entropy between the two half-chains is calculated with the density-matrix renormalization method (DMRG).We find a logarithmic behaviour with an effective central charge c' varying with the length of the system. It flows to one in the ferromagnetic region and to zero in the antiferromagnetic region of the model. In the XX case it has a non-universal limit and we recover previous results.

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