Ground-state properties and quantum entanglement in rung-dimerized spin-1/2 antiferromagnetic ladder |
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Authors: | Rui-Xue Li Shu-Ling Wang Kai-Lun Yao Hua-Hua Fu |
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Institution: | 1. School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China;2. International Center of Materials Physics, Chinese Academy of Science, Shenyang 110015, China |
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Abstract: | The ground-state properties and quantum entanglement of the two-leg rung-dimerized spin-1/2 Heisenberg antiferromagnetic ladders are investigated based on the Green? function combined with the Bond mean-field theory. Numerical results show that the ground-state energies do not change with the rung dimerization, and the ground-state gaps are almost proportionate to the rung dimerization coefficient δ and coupling strength α . Magnetization curves and entanglement measurements demonstrate that there are five magnetic phases, which are identified in the h–δ phase diagram. Entanglement measurements in different phases exhibit distinct behaviors, implying the fundamental differences of the five magnetic phases. |
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Keywords: | Spin ladder Quantum phase transition Quantum entanglement Concurrence |
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