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arXiv 1812.06201cond-mat.quant-gas
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Aubry-André模型作为理解局部化现象的工具

The Aubry-André model as the hobbyhorse for understanding localization phenomenon

G. A. Domínguez-Castro, R. Paredes

摘要:

我们提出了一个彻底的教学分析的单粒子局域化现象中的准周期晶格在一个维度。晶格中无序的描述由Aubry-André模型表示。本地化的表征是通过静态和动态特性的分析来进行的。研究的平稳特性是反参与比(IPR),归一化参与比(NPR)和作为无序强度的函数的能谱。正如预期的那样,发现了独特的Hofstadter图案。两个动力学量允许辨别的本地化现象,即初始本地化状态的扩展和在整个晶格的奇偶位置的布居不平衡的演变。

英文摘要:

We present a thorough pedagogical analysis of the single particle localization phenomenon in a quasiperiodic lattice in one dimension. Description of disorder in the lattice is represented by the Aubry-André model. Characterization of localization is performed through the analysis of both, stationary and dynamical properties. The stationary properties investigated are the inverse participation ratio (IPR), the normalized participation ratio (NPR) and the energy spectrum as a function of the disorder strength. As expected, the distinctive Hofstadter pattern is found. Two dynamical quantities allow discerning the localization phenomenon, being the spreading of an initially localized state and the evolution of population imbalance in even and odd sites across the lattice.

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