Observation of doubled edge states in extended Su-Schrieffer-Heeger electric circuits with long-range coupling interactions

Abstract In this work, we construct extended SSH(eSSH) circuit models with long-range coupling. Based on the theoretical and experimental results, we verify that the eSSH model with long-range coupling interactions has additional quantized winding number equal to two and contains two edge states at each side. We further discuss the existence of edge states for different lattice-hopping scenarios. Our work not only substantiates the existence of doubled edge states in eSSH circuits, but also enriches the study of circuit systems for long-range coupling.