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Thermal entanglement in the mixed three-spin XXZ Heisenberg model on a triangular cell |
| Seyit Deniz Han, Ekrem Aydiner |
| Department of Physics, īstanbul University, īstanbul Tr-34134, Turkey |
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Abstract We numerically investigate the thermal entanglements of spins (1/2, 1) and spins (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 the pairwise thermal entanglement for fixed parameters of the Hamiltonian in the cases of ferromagnetic and antiferromagnetic interactions. We also observe an unexpected critical point at finite temperature in the thermal entanglement of spins (1/2, 1) for the antiferromagnetic case, while the entanglement of spins (1/2, 1) in the ferromagnetic case and the entanglement of spins (1/2, 1/2) in both ferromagnetic and antiferromagnetic cases almost decay exponentially to zero with increasing temperature. The critical point in the entanglement of spins (1/2, 1) in the antiferromagnetic case may be a signature of the quantum phase transition at finite temperature.
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Received: 30 July 2013
Revised: 18 October 2013
Accepted manuscript online:
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PACS:
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03.65.Ud
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(Entanglement and quantum nonlocality)
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64.70.Tg
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(Quantum phase transitions)
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| Fund: Project supported by īstanbul University (Grant Nos. 19240 and 28432). |
Corresponding Authors:
Ekrem Aydiner
E-mail: ekrem.aydiner@istanbul.edu.tr
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| About author: 03.65.Ud; 64.70.Tg |
Cite this article:
Seyit Deniz Han, Ekrem Aydiner Thermal entanglement in the mixed three-spin XXZ Heisenberg model on a triangular cell 2014 Chin. Phys. B 23 050305
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