(De)localization and the mobility edges in a disordered double chain with long-range intrachain correlation and short-range interchain correlation
(De)localization and the mobility edges in a disordered double chain with long-range intrachain correlation and short-range interchain correlation
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DOI：
10.1088/0953-8984/24/24/245502
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发表时间：
2012-06
期刊：
影响因子：
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通讯作者：
Yi Zhao;S. Duan;Wei Zhang
中科院分区：
文献类型：
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作者：
Yi Zhao;S. Duan;Wei Zhang
相关效应和相变是当前无序系统研究的中心问题。本文研究了具有长链内相关和短链间相关的无序双链的电子性质。基于详细的数值计算、有限尺度分析和经验分析计算，我们得到了一个由于无序、短程和远程相关关系相互作用而包含丰富物理性质的相图。除了远程相关引起的局域-离域相变外，我们还发现了一阶和二阶量子相变都是通过改变短程相关引起的。有趣的是，局部化可以通过增加某些参数范围内的无序强度来抑制，而“反相关”导致最局部化状态。我们的研究揭示了DNA分子中电荷传输的机制，这两种类型的相关疾病都存在。
Correlation effects and phase transitions are central issues in current studies on disordered systems. In this paper, we study the electronic properties of a disordered double chain with long-range intrachain correlation and short-range interchain correlation. Based on detailed numerical calculations, finite size scaling analysis and empirical analytical calculations, we obtain a phase diagram containing rich physics due to the interplay among the disorder, short-range and long-range correlations. Besides the long-range correlation induced localization–delocalization transitions, we find both first-order and second-order quantum phase transitions on changing the short-range correlation. Interestingly, the localization may be suppressed by increasing the disorder strength in some parameter regime and the ‘anti-correlation’ leads to the most delocalized state. Our studies shine some light on the mechanism of the charge transport in DNA molecules, where both types of correlated disorders are present.