Existence of dimerized phases in frustrated spin ladder models
Existence of dimerized phases in frustrated spin ladder models
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DOI：
10.1103/physrevb.77.214418
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发表时间：
2008-06
影响因子：
3.7
通讯作者：
Guang-Hua Liu;Hai-Long Wang;G. Tian
中科院分区：
文献类型：
--
作者：
Guang-Hua Liu;Hai-Long Wang;G. Tian
本文利用密度矩阵重整化群技术，研究了受阻自旋1/2阶梯模型中二聚化相的存在性。通过计算两级局域纠缠，特别是基态的一阶导数，我们发现在单重态和霍尔丹相之间的一个较窄的参数范围内确实存在一个中间的柱状二聚相。此外，通过引入额外的链间次近邻交换作用，可以大大提高该相的稳定性，并且在相图中还出现了交错的二聚化相。我们的结果证实了以前用玻色化方法得出的结论。
In the present paper, by using the density-matrix renormalization-group technique, we investigate the existence of dimerized phases in a frustrated spin-1/2 ladder model. By calculating the two-rung localizable entanglement and, in particular, its first-order derivative in the ground state, we show that an intermediate columnar dimerized phase exists indeed in a narrow parameter region between the rung-singlet and the Haldane phases. Furthermore, by introducing an additional interchain next-nearest-neighbor exchange interaction, the stability of this phase can be greatly enhanced and a staggering dimerized phase also appears in the phase diagram. Our results confirm the previous conclusions derived by the bosonization methods.