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Thermal entanglement in the mixed three spin XXZ Heisenberg Model on a triangular cell |
| EKREM AYDINER,Deniz Han |
| ISTANBUL UNIVERSITY |
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Abstract We numerically investigate thermal entanglement of the spins (1/2,1)
and (1/2,1/2) in the three-mixed (1/2,1,1/2) anisotropic Heisenberg
XXZ spin system on a simple triangular cell under an inhomogeneous
magnetic field. We show that the external magnetic field induces
strong plateau formation in pairwise thermal entanglement for fixed
parameters of Hamiltonian in the case of the ferromagnetic and
anti-ferromagnetic interactions. We also observe an unexpected
critical point at finite temperature in the thermal entanglement of
the spins (1/2,1) for antiferromagnetic case while the entanglement
of the spins (1/2,1) for ferromagnetic case and the entanglement of
the spins (1/2,1/2) for both ferromagnetic and antiferromagnetic
cases almost decays exponentially to zero with increasing
temperature. The critical point in entanglement of the spins (1/2,1)
for antiferromagnetic case may be signature of the quantum phase
transition at finite temperature.
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Received: 31 July 2013
Revised: 18 October 2013
Published: 07 November 2013
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Corresponding Authors:
EKREM AYDINER
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Cite this article:
EKREM AYDINER Deniz Han Thermal entanglement in the mixed three spin XXZ Heisenberg Model on a triangular cell Chin. Phys. B 0
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