弱磁力拓扑绝缘体中位错的陷阱态
Trapped state at a dislocation in a weak magnetomechanical topological insulator
摘要：
拓扑绝缘体（TI）的特征在于绝缘体和其边界上的对称保护束缚态。“强”拓扑绝缘体的特征在于受某些内部对称性保护的\emph{all}边界上的稳健导电状态。然而，“弱”拓扑绝缘体（WTI）需要晶格平移对称性，使其对无序更敏感。然而，这种敏感性引起了有趣的特性，如各向异性的边缘模式，量子化的电荷极化，并出现在位错缺陷的束缚态。尽管拥有有趣的功能，WTI对疾病的敏感性构成了实验确认的挑战。在这里，我们实现了一个2D磁机械超材料，并通过实验证明了WTI的独特功能。具体来说，我们表明，二维WTI是各向异性的主机边缘模式只在某些边缘，以及托管在位错缺陷的束缚态。我们构建的2D WTI从堆叠的1D SSH链，我们在实验上显示了不同的间隙阶段的1D模型。
英文摘要：
Topological insulators (TIs) are characterized by an insulating bulk and symmetry protected bound state on their boundaries. A "strong" topological insulator is characterized by robust conducting states on \emph{all} boundaries protected by certain internal symmetries. A "weak" topological insulator (WTI) however, requires lattice translation symmetry, making it more sensitive to disorder. However, this sensitivity gives rise to interesting characteristics such as anisotropic edge modes, quantized charge polarization, and bound states appearing at dislocation defects. Despite hosting interesting features, the sensitivity of WTIs to disorder poses an experimental confirmation challenge. Here we realize a 2D magneto-mechanical metamaterial and demonstrate experimentally the unique features of a WTI. Specifically, we show that the 2D WTI is anisotropic and hosts edge modes only on certain edges, as well as hosting a bound state at a dislocation defect. We construct the 2D WTI from stacked 1D SSH chains for which we show experimentally the different gapped phases of the 1D model.
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