Ground-state properties and quantum entanglement in rung-dimerized spin-1/2 antiferromagnetic ladder

被引：4
|
作者：
Li, Rui-Xue [1 ,2 ]
Wang, Shu-Ling [1 ,2 ]
Yao, Kai-Lun [1 ,2 ,3 ]
Fu, Hua-Hua [1 ,2 ]
机构：
[1] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China
[2] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Peoples R China
[3] Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110015, Peoples R China
来源：
PHYSICS LETTERS A | 2013年 / 377卷 / 37期
基金：
中国国家自然科学基金;
关键词：
Spin ladder; Quantum phase transition; Quantum entanglement; Concurrence; MAGNETIZATION PLATEAUS; HEISENBERG; TRANSITION; GAP;
D O I：
10.1016/j.physleta.2013.07.016
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 delta and coupling strength alpha. Magnetization curves and entanglement measurements demonstrate that there are five magnetic phases, which are identified in the h-delta phase diagram. Entanglement measurements in different phases exhibit distinct behaviors, implying the fundamental differences of the five magnetic phases. (c) 2013 Elsevier B.V. All rights reserved.
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页码：2422 / 2427
页数：6
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