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Realization of quasicrystalline quadrupole topological insulators in electrical circuits
Communications Physics ( IF 5.5 ) Pub Date : 2021-05-26 , DOI: 10.1038/s42005-021-00610-7
Bo Lv , Rui Chen , Rujiang Li , Chunying Guan , Bin Zhou , Guohua Dong , Chao Zhao , YiCheng Li , Ying Wang , Huibin Tao , Jinhui Shi , Dong-Hui Xu

Quadrupole topological insulators are a new class of topological insulators with quantized quadrupole moments, which support protected gapless corner states. The experimental demonstrations of quadrupole-topological insulators were reported in a series of artificial materials, such as photonic crystals, acoustic crystals, and electrical circuits. In all these cases, the underlying structures have discrete translational symmetry and thus are periodic. Here we experimentally realize two-dimensional aperiodic-quasicrystalline quadrupole-topological insulators by constructing them in electrical circuits, and observe the spectrally and spatially localized corner modes. In measurement, the modes appear as topological boundary resonances in the corner impedance spectra. Additionally, we demonstrate the robustness of corner modes on the circuit. Our circuit design may be extended to study topological phases in higher-dimensional aperiodic structures.



中文翻译:

电路中准晶四极拓扑绝缘子的实现

四极拓扑绝缘子是具有量化四极矩的新型拓扑绝缘子,支持受保护的无间隙转角状态。在一系列人造材料(例如光子晶体,声晶体和电路)中报道了四极拓扑绝缘子的实验演示。在所有这些情况下,下面的结构具有离散的平移对称性,因此是周期性的。在这里,我们通过在电路中构建二维非周期性准晶体四极杆拓扑绝缘子,并观察其在光谱和空间局部的拐角模式。在测量中,这些模式在拐角阻抗谱中表现为拓扑边界共振。此外,我们演示了电路上转角模式的鲁棒性。

更新日期:2021-05-26
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