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arXiv 2105.04591cond-mat.dis-nncond-mat.quant-gasphysics.opticsquant-ph
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一维准周期模型中的反常迁移率边

Anomalous mobility edges in one-dimensional quasiperiodic models

Tong Liu, Xu Xia, Stefano Longhi, Laurent Sanchez-Palencia

摘要:

迁移率边缘,从扩展状态的本地化,是众所周知的,出现在单粒子能谱的无序系统的维度严格高于2和某些准周期模型的一维。在这里,我们揭示了一个不同的类的迁移率边缘,被称为异常迁移率边缘,分离带的本地化状态带的临界状态在对角和非对角准周期模型。首先,我们引入了一个精确可解的准周期对角模型,并解析地证明了反常迁移率边缘的存在。此外,相应的波函数的数值多重分形分析证实了临界状态的有限带的出现。然后,我们将研究扩展到一个准周期的非对角Su-Schrieffer-Heeger模型,并显示了异常迁移率边缘的数值证据。最后,我们讨论了可能的实验实现的准周期模型托管异常迁移率边缘。这些结果为研究低维非周期系统的局部化和临界性质提供了新的思路。

英文摘要:

Mobility edges, separating localized from extended states, are known to arise in the single-particle energy spectrum of disordered systems in dimension strictly higher than two and certain quasiperiodic models in one dimension. Here we unveil a different class of mobility edges, dubbed anomalous mobility edges, that separate bands of localized states from bands of critical states in diagonal and off-diagonal quasiperiodic models. We first introduce an exactly solvable quasi-periodic diagonal model and analytically demonstrate the existence of anomalous mobility edges. Moreover, numerical multifractal analysis of the corresponding wave functions confirms the emergence of a finite band of critical states. We then extend the sudy to a quasiperiodic off-diagonal Su-Schrieffer-Heeger model and show numerical evidence of anomalous mobility edges. We finally discuss possible experimental realizations of quasi-periodic models hosting anomalous mobility edges. These results shed new light on the localization and critical properties of low-dimensional systems with aperiodic order.

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