Entanglement properties in (1/2,1) mixed-spin Heisenberg systems

Details Entanglement properties in (1/2,1) mixed-spin Heisenberg systems Entanglement properties in (1/2,1) mixed-spin Heisenberg systems

2005-08-27

arxiv.org/abs/quant-ph/0508208v1

Physica A: Statistical and Theoretical Physics, Volume 370, Issue 2, Pages 483-500 (2005)

Physics

Quantum Physics

11 pages, 12 figures

Scientific paper

10.1016/j.physa.2006.03.020

By using the concept of negativity, we investigate entanglement in (1/2,1) mixed-spin Heisenberg systems. We obtain the analytical results of entanglement in small isotropic Heisenberg clusters with only nearest-neighbor (NN) interactions up to four spins and in the four-spin Heisenberg model with both NN and next-nearest-neighbor (NNN) interactions. For more spins, we numerically study effects of temperature, magnetic fields, and NNN interactions on entanglement. We study in detail the threshold value of the temperature, after which the negativity vanishes.

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