ac-field-controlled localization-delocalization transition in a one-dimensional disordered system
ac-field-controlled localization-delocalization transition in a one-dimensional disordered system
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DOI：
10.1103/physrevb.74.115304
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发表时间：
2006-03
影响因子：
3.7
通讯作者：
Wei Zhang;S. Ulloa
中科院分区：
文献类型：
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作者：
Wei Zhang;S. Ulloa
基于随机二聚体模型，研究了在强交流场驱动下一维系统的相关无序性。由于随机系统中的相关可以在直流场中产生扩展状态并增强输运，我们探索了交流场对这些特性的作用。我们发现与有序结构相似，交流场将有效跳变常数重新规格化到更小的值，从而有助于局部化状态。我们发现在给定的一维相关无序系统中，交流场控制着一个局域-离域跃迁。带重整化（带塌缩和动态局域化）、安德森局域化和结构相关之间的竞争导致了有趣的输运性质。
Based on the random dimer model, we study correlated disorder in a one-dimensional system driven by a strong ac field. As the correlations in a random system may generate extended states and enhance transport in dc fields, we explore the role that ac fields have on these properties. We find that similar to ordered structures, ac fields renormalize the effective hopping constant to a smaller value and thus help to localize a state. We find that ac fields control then a localization-delocalization transition in a given one-dimensional system with correlated disorder. The competition between band renormalization (band collapse and dynamic localization), Anderson localization, and the structure correlation is shown to result in interesting transport properties.