Entanglement in spin-one Heisenberg chains

Details Entanglement in spin-one Heisenberg chains Entanglement in spin-one Heisenberg chains

2005-01-07

arxiv.org/abs/quant-ph/0501032v1

Physics

Quantum Physics

7 pages and 4 figures

Scientific paper

10.1088/0305-4470/38/40/014

By using the concept of negativity, we study entanglement in spin-one Heisenberg chains. Both the bilinear chain and the bilinear-biquadratic chain are considered. Due to the SU(2) symmetry, the negativity can be determined by two correlators, which greatly facilitate the study of entanglement properties. Analytical results of negativity are obtained in the bilinear model up to four spins and the two-spin bilinear-biquadratic model, and numerical results of negativity are presented. We determine the threshold temperature before which the thermal state is doomed to be entangled.

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