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Thermal Entanglement of Anisotropic XY Chains in a Transverse Field |
| ZHAI Xiao-Yue1,2;TONG Pei-Qing1 |
| 1Department of Physics, Nanjing Normal University, Nanjing 2100972Institute of Science, PLA University of Science and Technology, Nanjing 210007 |
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| Cite this article: |
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ZHAI Xiao-Yue, TONG Pei-Qing 2007 Chin. Phys. Lett. 24 2475-2478 |
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Abstract
By using the concept of concurrence, we numerically investigate the
thermal entanglement between any two nearest-neighbour spins in uniform
and periodic anisotropic XY chains in a transverse field at finite
temperature T. It is found that the entanglement has more than one
critical temperatures on some parameter regions for uniform and periodic
chains. We also discuss the behaviour of the thermal entanglement at the
vicinity of quantum phase transition of periodic anisotropic XY chains
and find that all the derivatives ∂λ have similar behaviour as that of the uniform chain.
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| Keywords:
03.67.-a
03.65.Ud
05.50.+q
75.10.Jm
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Received: 01 April 2007
Published: 16 August 2007
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| PACS: |
03.67.-a
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(Quantum information)
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03.65.Ud
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(Entanglement and quantum nonlocality)
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05.50.+q
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(Lattice theory and statistics)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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