Topological states in a kagome lattice have been observed in resonant circuits

A study conducted by Kenichi Yatsugi et al. was published in the Scientific Reports.

Topological phases of matter have been extensively explored as a unique way for manipulating waves such as electromagnetic waves. Conventional d-dimensional topological insulator supports (d-1)-dimensional boundary states. On the other hand, recently discovered higher-order topological insulators which can support boundary states in (d-2)-dimensions are attracting attentions. However, the implementation of an experimental setup with variable parameter control has been a challenge. Here, we have achieved zero-dimensional topological states in a two-dimensional kagome lattice by arranging magnetically coupled resonant circuits. In this system, the topological phases are controlled by distances between the resonant circuits. This system is a promising platform for experimental investigations of topological phases as well as a novel wireless power transfer mechanism.

Title: Higher-order Topological Corner State in a Reconfigurable Breathing Kagome Lattice Consisting of Magnetically Coupled LC Resonators
Authors: Yatsugi, K., Pandarakone, SE., Iizuka H.
Journal Name: Scientific Reports
Published: May 23, 2023
https://doi.org/10.1038/s41598-023-35509-6