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arXiv 2301.04565cond-mat.dis-nncond-mat.mes-hallcond-mat.str-el
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拓扑安德森跃迁的剖析

Anatomy of topological Anderson transitions

Hao Zhang, Alex Kamenev

AI总结:

该研究针对拓扑无序链的拓扑安德森跃迁介观特征,提出有限尺寸系统的样本特异性整数值拓扑指数定义,发现拓扑岛结构及两类对称下的定性差异,还探讨了相关可观测特征。

摘要:

我们研究了拓扑无序链中拓扑安德森跃迁的介观特征。为此,我们提出了有限尺寸系统中拓扑指数的整数值、样本特异性定义。其相图呈现出一种引人关注的间歇拓扑相结构,被称为拓扑岛(topological islands)。拓扑岛的存在根源于底层随机多项式的实零点。它们的统计特性表现出有限尺寸标度行为,可指示体相拓扑安德森跃迁的位置。尽管AIII和BDI对称类的平均理论颇为相似,但二者对应的拓扑岛模式及其统计特性存在定性差异。我们还讨论了介观系统中锐拓扑跃迁的可观测特征,例如持续电流和纠缠谱。

英文摘要:

We study mesoscopic signatures of the topological Anderson transitions in topological disordered chains. To this end we introduce an integer-valued sample-specific definition of the topological index in finite size systems. Its phase diagram exhibits a fascinating structure of intermittent topological phases, dubbed topological islands. Their existence is rooted in the real zeros of the underlying random polynomial. Their statistics exhibits finite-size scaling, pointing to the location of the bulk topological Anderson transition. While the average theories in AIII and BDI symmetry classes are rather similar, the corresponding patterns of topological islands and their statistics are qualitatively different. We also discuss observable signatures of sharp topological transitions in mesoscopic systems, such as persistent currents and entanglement spectra.

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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