Low-lying excitations of the three-leg spin tube: A density-matrix renormalization group study

Low-lying excitations of the three-leg spin tube: A density-matrix renormalization group study
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三腿旋转管的低位激发:密度矩阵重正化群研究

DOI:
10.1103/physrevb.78.054421
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发表时间:
2008
期刊:
影响因子:
3.7
通讯作者:
M. Arikawa
M. Arikawa
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
S. Nishimoto;M. Arikawa

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利用(动态)密度矩阵重整化群方法,研究了在横截面方向上应用周期边界条件的三足反铁磁海森堡模型的低能物理。我们证实,只要内部耦合形成正三角形,自旋激发总是有间隙的。通过对自旋间隙和二聚化序参量的精确有限尺度分析,我们还发现,自旋间隙可以通过对内部耦合进行非常小的不对称调制而坍塌。此外,还计算了影响腿内和腿间相关的动态自旋结构因子。结果表明,不对称调制对腿间谱的低洼结构影响较大。
Using the (dynamical) density-matrix renormalization group method, we study the low-energy physics of three-leg antiferromagnetic Heisenberg model where the periodic boundary conditions are applied in the rung direction. We confirm that the spin excitations are always gapped as long as the intraring couplings form a regular triangle. From precise finite-size-scaling analyses of the spin gap and dimerization order parameter, we also find that the spin gap is collapsed by very small asymmetric modulation of the intraring couplings. Moreover, the dynamical spin structure factors on the intraleg and interleg correlations are calculated. It is demonstrated that the low-lying structure of the interleg spectra is particularly affected by the asymmetric modulation.
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DOI: --
发表时间: 2005
期刊: Physica E 23・3-4
影响因子: --
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