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IMPURITY EFFECTS ON THE ENTANGLEMENT OF SPIN-ONE HEISENBERG MODEL

MING-LIANG HU

Department of Applied Mathematics and Applied Physics, Xi'an Institute of Posts and Telecommunications, Xi'an, 710061, China

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https://doi.org/10.1142/S0217984908016595Cited by:5 (Source: Crossref)

Abstract

The entanglement characteristics of the three-qutrit spin-one Heisenberg chain in the presence of one impurity site is investigated by using the concept of negativity. The results show that the existence of impurity can lead to an enhancement of both bipartite and pairwise entanglement for certain ranges of the impurity parameter, and the amount of entanglement can be controlled and tuned by varying the impurity parameter J₁. The results also show that the thermal fluctuations always suppress the entanglement and as a result there exists a threshold temperature T_th after which the entanglement vanishes. T_th increases as J₁ increases except the case for that of the pairwise negativity which measures entanglement between the two norm spins in the chain.

Keywords:

PACS: 03.65.Ud, 03.67.-a, 03.67.Lx, 75.10.Jm

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