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arXiv 0907.0252quant-phcond-mat.other
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Aubry-André模型之外一维无公度晶格的局域化

Localization in one-dimensional incommensurate lattices beyond the Aubry-André model

J. Biddle, B. Wang, D. J. Priour, S. Das Sarma

摘要:

利用紧束缚Aubry-André(AA)模型以外的模型研究了无相互作用的一维无公度晶格中粒子的局域化性质。基于紧束缚t_1 - t_2模型和有限次近邻跳跃t_2,我们发现了与AA模型不同的局部化性质,表现为迁移率边缘的出现.然后,我们进一步超越紧束缚假设,直接研究系统的基础上更基本的单粒子薛定谔方程。通过这种方法,我们还观察到的流动性的边缘和本地化属性依赖于inconversion的存在。

英文摘要:

Localization properties of particles in one-dimensional incommensurate lattices without interaction are investigated with models beyond the tight-binding Aubry-André (AA) model. Based on a tight-binding t_1 - t_2 model with finite next-nearest-neighbor hopping t_2, we find the localization properties qualitatively different from those of the AA model, signaled by the appearance of mobility edges. We then further go beyond the tight-binding assumption and directly study the system based on the more fundamental single-particle Schrödinger equation. With this approach, we also observe the presence of mobility edges and localization properties dependent on incommensuration.

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