Research / 2019 / Article / Fig 2

Research Article

Topologically Protected Edge State in Two-Dimensional Su–Schrieffer–Heeger Circuit

Figure 2

Fabricated sample, simulation, and experimental results of the 2D SSH circuit. (a,b) Photograph and zoomed view of the fabricated sample with 7.25×7.25 unit cells. All the boundary sites are terminated by inductors La. (c,d) Schematic illustration of the circuits without and with defect, respectively. The blue and red lines represent inductors La and Lb, respectively, while the black sphere represents the grounded capacitors. The red wavelike curve indicates the nontrivial edge states. (e,f) Experimentally measured results of the absorptance distribution at the lower bandgap (averaged between 25.2 and 28.6 MHz) for the cases without and with defect, respectively. (g,h) Theoretical results of the absorptance distribution at the lower bandgap (30 MHz) for the cases without and with defect, respectively.