论文标题
二维量子磁铁中电荷中性边缘状态的局部探针
Local Probes for Charge-Neutral Edge States in Two-Dimensional Quantum Magnets
论文作者
论文摘要
宽大的对应关系是物质拓扑状态的定义特征。但是，对于量子磁体，例如自旋液体或拓扑镁绝缘子，直接观察拓扑表面状态已被证明具有挑战性，因为激发的电荷中性特征。在这里，我们提出自旋扫描隧道显微镜作为自旋敏感的局部探针，以提供有关电荷中性拓扑边缘状态的直接信息。我们展示了如何通过专门利用现有技术的优势来提取它们的界面因素。作为我们的主要示例，我们确定具有开放边界的基塔夫蜂窝模型的动态自旋相关性。我们表明，通过对比批量和边缘位置的电导测量，可以提取存在分数激发和非平凡拓扑的直接特征。这种方法的广泛适用性通过Kagome拓扑磁化绝缘子的第二个例子来证实。
The bulk-boundary correspondence is a defining feature of topological states of matter. However, for quantum magnets such as spin liquids or topological magnon insulators a direct observation of topological surface states has proven challenging because of the charge-neutral character of the excitations. Here we propose spin-polarized scanning tunneling microscopy as a spin-sensitive local probe to provide direct information about charge neutral topological edge states. We show how their signatures, imprinted in the local structure factor, can be extracted by specifically employing the strengths of existing technologies. As our main example, we determine the dynamical spin correlations of the Kitaev honeycomb model with open boundaries. We show that by contrasting conductance measurements of bulk and edge locations, one can extract direct signatures of the existence of fractionalized excitations and non-trivial topology. The broad applicability of this approach is corroborated by a second example of a kagome topological magnon insulator.
