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arXiv 2501.02883cond-mat.dis-nnquant-ph
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斐波那契调制诱导的多重拓扑安德森绝缘体

Fibonacci-Modulation-Induced Multiple Topological Anderson Insulators

Ruijiang Ji, Zhihao Xu

AI总结:

本文研究斐波那契调制下一维自旋轨道耦合链中多重拓扑安德森绝缘体的产生机制,发现SOC幅度减小会使TAI相增多,且波函数呈现多重分形特征,并可通过玻色-爱因斯坦凝聚体的淬火动力学进行实验验证。

摘要:

拓扑安德森绝缘体(TAIs)为无序系统中的拓扑相变提供了一种机制,并对量子材料设计具有重要意义。在本工作中,我们研究了一维自旋轨道耦合(SOC)链在斐波那契调制下多重TAIs的出现,该调制将平庸的能带结构转变为一系列拓扑非平庸相。这一行为以零能模式的出现和$Z_2$拓扑量子数的变化为特征。随着SOC幅度的减小,TAI相的数量增加,这一特征与斐波那契调制所诱导的能谱分形结构密切相关。与具有完全局域化本征态的常规TAI相不同,斐波那契调制的TAI相中的波函数表现出多重分形性质。该模型可以利用动量空间晶格中的玻色-爱因斯坦凝聚体在实验上实现,其中其拓扑转变和多重分形特征可以通过淬火动力学进行探索。

英文摘要:

Topological Anderson insulators (TAIs) provide a mechanism for topological phase transitions in disordered systems and have implications for quantum material design. In this work, we investigate the emergence of multiple TAIs in a one-dimensional spin-orbit coupled (SOC) chain subject to Fibonacci modulation, which transforms a trivial band structure into a sequence of topologically nontrivial phases. This behavior is characterized by the appearance of zero-energy modes and changes in the $Z_2$ topological quantum number. As the SOC amplitude decreases, the number of TAI phases increases, a feature that is closely related to the fractal structure of the energy spectrum induced by Fibonacci modulation. In contrast to conventional TAI phases with fully localized eigenstates, the wave functions in the Fibonacci-modulated TAI phases display multifractal properties. This model can be experimentally realized using a Bose-Einstein condensate in a momentum-space lattice, where its topological transitions and multifractal features can be explored through quench dynamics.

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。

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