论文标题
强烈无定形散射网络中的异常拓扑波
Anomalous topological waves in strongly amorphous scattering networks
论文作者
论文摘要
拓扑绝缘子是结晶材料，它彻底改变了我们控制波传输的能力。它们为我们提供了对障碍物，缺陷或局部疾病免疫的单向通道，甚至可以在其晶体结构的某些随机变形中生存。但是，当混乱或非态度太大时，它们总是分解，过渡到拓扑琐碎的安德森绝缘阶段。在这里，我们展示了一种二维无定形拓扑结构，该状态可在任意强大的非态度上幸存下来。我们将其用于非转录散射网络中的电磁波，并在实验上证明了在强无定形极限中存在单向边缘转运。该边缘传输被证明是由一个异常的边缘状态介导的，其拓扑起源是直接拓扑不变的测量结果。我们的发现将拓扑物理学的覆盖范围扩展到了一类新的系统，在这些系统中，强烈的非态度可以诱导，增强和保证拓扑边缘运输而不是阻碍它。
Topological insulators are crystalline materials that have revolutionized our ability to control wave transport. They provide us with unidirectional channels that are immune to obstacles, defects or local disorder, and can even survive some random deformations of their crystalline structures. However, they always break down when the level of disorder or amorphism gets too large, transitioning to a topologically trivial Anderson insulating phase. Here, we demonstrate a two-dimensional amorphous topological regime that survives arbitrarily strong levels of amorphism. We implement it for electromagnetic waves in a non-reciprocal scattering network and experimentally demonstrate the existence of unidirectional edge transport in the strong amorphous limit. This edge transport is shown to be mediated by an anomalous edge state whose topological origin is evidenced by direct topological invariant measurements. Our findings extend the reach of topological physics to a new class of systems in which strong amorphism can induce, enhance and guarantee the topological edge transport instead of impeding it.
