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The ground-state entanglement in the spin-XX chain with a magnetization current |
Zhang Yong(张勇)†, Wang Chuan(王川), and Jin Guang-Sheng(金光生) |
Department of Physics, Beijing University of Posts and Telecommunications, Beijing 100876, China |
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Abstract The ground-state entanglement in a transverse spin-1/2 XX chain with a magnetization current is studied. By introducing a magnetization current to the system, a quantum phase transition to current-carrying phase may be presented with the variation of the driving field $\lambda$ for the magnetic field h >1; and the ground-state entanglement arises simultaneously at the critical point of quantum phase transition. In our model, the introduction of magnetization current may result in more entanglement between any two nearest-neighbour spins.
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Received: 09 April 2010
Revised: 02 June 2010
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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75.40.-s
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(Critical-point effects, specific heats, short-range order)
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75.60.Ej
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(Magnetization curves, hysteresis, Barkhausen and related effects)
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Fund: Project supported by the National Fundamental Research Program of China (Grant No. 2010CB923202), the National Natural Science Foundation of China (Grant Nos. 10704010, 10947151 and 60704017), Chinese Universities Scientific Fund (Grant No. BUPT2009RC0710), and the SRFDP Program of Education Ministry of China. |
Cite this article:
Zhang Yong(张勇), Wang Chuan(王川), and Jin Guang-Sheng(金光生) The ground-state entanglement in the spin-XX chain with a magnetization current 2010 Chin. Phys. B 19 110308
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