论文标题
观察在声学分形晶格中挤压的雪恩绝缘子
Observation of squeezed Chern insulator in an acoustic fractal lattice
论文作者
论文摘要
拓扑绝缘子是物质的新阶段，具有绝缘体和进行边缘状态的独特特征。最近的理论表明，在分形晶格中甚至存在拓扑边缘状态，这与依赖整数维度的当前研究根本不同。在这里，我们提出并在实验中证明了分形的声学晶格中挤压的Chern绝缘子。首先，通过计算拓扑分形系统的拓扑不变，我们发现拓扑相图被挤压约0.54次，与原始的Haldane模型相比。然后，通过将合成规通量引入声学分形晶格中，我们在实验中观察到受挤压拓扑状态内强大的迁移率差距保护的单向边缘状态。我们的工作展示了声学拓扑分形绝缘子的第一个例子，并为声波的高级控制提供了新的方向。
Topological insulators are a new phase of matter with the distinctive characteristics of an insulating bulk and conducting edge states. Recent theories indicate there even exist topological edge states in the fractal-dimensional lattices, which are fundamentally different from the current studies that rely on the integer dimensions. Here, we propose and experimentally demonstrate the squeezed Chern insulator in a fractal-dimensional acoustic lattice. First, through calculating the topological invariant of our topological fractal system, we find the topological phase diagram is squeezed by about 0.54 times, compared with that of the original Haldane model. Then by introducing synthetic gauge flux into an acoustic fractal lattice, we experimentally observe the one-way edge states that are protected by a robust mobility gap within the squeezed topological regimes. Our work demonstrates the first example of acoustic topological fractal insulators and provides new directions for the advanced control of sound waves.
