长程形变下的拓扑谷输运
Topological valley transport under long-range deformations
AI总结：
本文研究了长程形变下拓扑光子晶体的边缘态输运，通过随机移动蜂窝晶格顶点构建形变系统，发现手性源敏感而线偏振源可激发并检测到拓扑输运，为利用形变晶格材料的拓扑性质开辟了道路。
摘要：
由光子晶体体拓扑保护的边缘态对短程无序表现出鲁棒性，使得鲁棒的信息传输成为可能。本文研究了长程形变下的拓扑光子晶体。通过将蜂窝晶格结构中每个正六边形的顶点随机移动，建立了一个形变系统。通过增加随机形变的程度，研究了从有序系统到无序系统的转变，其中清晰地展示了拓扑带隙的闭合。我们进一步对所提出形变系统的激发方法进行了全面研究。由于缺乏严格的周期性，拓扑边缘模式的激发变得困难。分别研究了手性和线偏振源作为两种不同的方法。研究发现，手性源较为敏感且依赖于有序晶格。即使是弱的长程形变也会给传输带来波动。我们进一步设计并制备了在微波波段工作的金属-介电-金属三明治状样品。使用线偏振源，我们检测到了形变系统中拓扑输运的存在。这项工作研究了体拓扑对长程形变的激发和鲁棒性，并可能为开发具有形变晶格的材料的拓扑性质开辟道路。
英文摘要：
Edge states protected by bulk topology of photonic crystals show robustness against short-range disorder, making robust information transfer possible. Here, topological photonic crystals under long-range deformations are investigated. Vertices of each regular hexagon in a honeycomb crystalline structure are shifted randomly to establish a deformed system. By increasing the degree of random deformations, a transition from an ordered system to an amorphous system are investigated, where the close of topological bandgap is clearly shown. We further present comprehensive investigations into excitation methods of the proposed deformed system. Due to the lack of strict periodicity, excitation of topological edge modes becomes difficult. Chiral and linearly polarized sources as two different methods are investigated respectively. It is found that chiral sources are sensitive and rely on the ordered lattice. Even a weak long-range deformation can bring fluctuations to transmission. We further designed and fabricated metal-dielectric-metal sandwich-like samples working in the microwave band. Using linearly polarized source, we detected the existence of topological transport in the deformed system. This work investigates excitation and robustness of bulk topology against long-range deformations and may open the way for exploiting topological properties of materials with a deformed lattice.
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