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arXiv 2202.13848cond-mat.mes-hall
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Su-Schrieffer-Heeger堆叠中涌现的高阶拓扑相

Higher-order topological phases emerging from the Su-Schrieffer-Heeger stacking

Xun-Jiang Luo, Xiao-Hong Pan, Chao-Xing Liu, Xin Liu

AI总结:

本文提出一种基于一维扩展Su-Schrieffer-Heeger模型沿正交方向堆叠来系统构造和分类二维高阶拓扑相的方法,发现角零能态可由边缘绕数统一表征,并推广至任意维度和超导系统。

摘要:

在这项工作中,我们发展了一种系统性的方法来构造和分类具有角零能态(CZESs)的二维(2D)高阶拓扑相的模型哈密顿量。我们的方法基于直接构造一系列二维系统中CZESs的解析解,这些系统将一维扩展Su-Schrieffer-Heeger(SSH)模型(即原始SSH模型的两个副本)沿两个正交方向堆叠。令人兴奋的是,我们的方法不仅给出了著名的Benalcazar-Bernevig-Hughes模型和二维SSH模型,还揭示了一个新模型,我们将其称为交叉二维SSH模型。尽管这三个模型表现出完全不同的体拓扑,我们发现CZESs可以普遍地由一维边缘态的边缘绕数来表征,这归因于它们统一的哈密顿量构造形式和边缘拓扑。值得注意的是,我们获得CZESs的原理可以很容易地推广到任意维度和超导系统。因此,我们的工作为高阶拓扑相的理论理解提供了新的视角,并为寻找高阶拓扑绝缘体和超导体铺平了道路。

英文摘要:

In this work, we develop a systematical approach of constructing and classifying the model Hamiltonians for two-dimensional (2D) higher-order topological phase with corner zero energy states (CZESs). Our approach is based on the direct construction of analytical solution of the CZESs in a series of 2D systems that stack the 1D extended Su-Schrieffer-Heeger (SSH) model, two copies of the original SSH model, along two orthogonal directions. Fascinatingly, our approach not only gives the celebrated Benalcazar-Bernevig-Hughes and 2D SSH models but also reveals a novel model and we refer it to crossed 2D SSH model. Although these three models exhibit completely different bulk topology, we find that the CZESs can be universally characterized by edge winding number for 1D edge states, attributing to their unified Hamiltonian construction form and edge topology. Remarkably, our principle of obtaining CZESs can be readily generalized to arbitrary dimension and superconducting systems. Thus, our work sheds new light on the theoretical understanding of the higher-order topological phase and paves the way to looking for higher-order topological insulators and superconductors.

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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