Distinguishing the Topological Zero Mode and Tamm Mode in a Microwave Waveguide Array
Distinguishing the Topological Zero Mode and Tamm Mode in a Microwave Waveguide Array
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区分微波波导阵列中的拓扑零模式和 Tamm 模式
DOI：
10.1002/andp.201900347
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发表时间：
2019-11-13
影响因子：
2.4
通讯作者：
Cheng, Qingqing
中科院分区：
文献类型：
--
作者：
Chen, Tao;Yu, Ye;Cheng, Qingqing
Su-Schrieffer-Heeger（SSH）模型是拓扑光子学中广泛实验研究的主题。理想地，现场电位和跳跃强度对于光子耦合波导阵列中的实施是足够精确的。在这里，两个本地化的边缘模式，拓扑零模式和平凡的Tamm模式，提出并证明了在修改的SSH模型使用微波光子波导阵列。所用的系统是由一个阵列的倏逝耦合波纹金属“H-酒吧”波导。此外，通过微波近场实验，在17 GHz的激励频率下，沿传播方向沿着40 cm的耦合行为，清楚地表明了零模和Tamm模之间的差异。这些发现将加深对耦合波导阵列系统和其他拓扑或量子系统中的局部边缘模限制机制的理解。
The Su-Schrieffer-Heeger (SSH) model has been the subject of extensive experimental research in the context of topological photonics. Ideally, the on-site potential and hopping strength are sufficiently accurate for implementation in photonic coupled waveguide arrays. Here, two localized edge modes, the topological zero mode and trivial Tamm mode, are proposed and demonstrated in the modified SSH model using a microwave photonic waveguide array. The system used is composed of an array of evanescently coupled ultrathin corrugated metallic "H-bar" waveguides. Furthermore, the differences between the zero mode and Tamm mode are clearly demonstrated by microwave near-field experiments on the coupling behavior along the propagation direction for 40 cm at the excitation frequency of 17 GHz. These findings should deepen the understanding of localized edge mode confinement mechanisms, both in coupled waveguide array systems and other topological or quantum systems.