arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2409.03591cond-mat.dis-nn
收藏

一维非厄米准晶体中的精确反常迁移率边

Exact anomalous mobility edges in one-dimensional non-Hermitian quasicrystals

Xiang-Ping Jiang, Weilei Zeng, Yayun Hu, Lei Pan

AI总结:

本文在两个一维非厄米准周期模型中,利用 Avila 全局理论解析推导出精确的反常迁移率边,并通过数值多重分形和能谱分析验证了临界态的存在及其拓扑起源。

摘要:

近期研究在理解非厄米(NH)准晶体中局域化转变以及区分扩展态与局域态的迁移率边(MEs)方面取得了重要进展。本文重点研究临界态和反常迁移率边,它们标识了两个不同的非厄米准周期模型中临界态与局域态之间的边界。具体而言,第一个模型是同时具有非互易跃迁项和原位势的准周期镶嵌晶格。相比之下,第二个模型具有无界准周期原位势和非互易跃迁。利用 Avila 全局理论,我们解析推导了 Lyapunov 指数和精确的反常迁移率边。为了确认两个模型中稳健临界态的出现,我们对波函数进行了数值多重分形分析,并对能级间距进行了谱分析。此外,我们还研究了实谱与复谱之间的转变以及反常迁移率边的拓扑起源。我们的结果可能为探索非厄米准周期系统中的临界态和反常迁移率边提供启发。

英文摘要:

Recent research has made significant progress in understanding localization transitions and mobility edges (MEs) that separate extended and localized states in non-Hermitian (NH) quasicrystals. Here we focus on studying critical states and anomalous MEs, which identify the boundaries between critical and localized states within two distinct NH quasiperiodic models. Specifically, the first model is a quasiperiodic mosaic lattice with both nonreciprocal hopping term and on-site potential. In contrast, the second model features an unbounded quasiperiodic on-site potential and nonreciprocal hopping. Using Avila's global theory, we analytically derive the Lyapunov exponent and exact anomalous MEs. To confirm the emergence of the robust critical states in both models, we conduct a numerical multifractal analysis of the wave functions and spectrum analysis of level spacing. Furthermore, we investigate the transition between real and complex spectra and the topological origins of the anomalous MEs. Our results may shed light on exploring the critical states and anomalous MEs in NH quasiperiodic systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑