Observation of Topological Corner States in a Kagome Circuit
DOI:
https://doi.org/10.54097/xn1fyz74Keywords:
Topological corner states, Kagome lattice, Circuit network, Higher-order topologyAbstract
Higher-order topological insulators enable energy localization at boundaries such as corners. Circuit platforms offer tunable components and flexible lattice design for simulating such topological states. Here, we implement a breathing Kagome lattice in an electric circuit network, where intra-cell and inter-cell couplings are independently controlled by capacitance values. Impedance spectroscopy and voltage mapping directly reveal topological corner states localized at two adjacent corners, with energies inside the bulk gap. These states emerge only under specific coupling conditions and remain robust against circuit parameter disorder. Our work demonstrates the feasibility of studying higher-order topology in Kagome lattices using circuit networks and offers a new route for exploring tunable topological corner states and their potential applications.
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