Observation of quadrupole transitions and edge mode topology in an LC circuit network

By Marc Serra-Garcia, Roman Susstrunk, Sebastian D. Huber. Physical review B, 2018

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Higher-order topological insulators belong to a recently discovered class of materials where nontrivial topology results in boundary states with a dimensionality two or more below that of the bulk. This work realizes a higher-order topological insulator in a circuit model. By using nonlinear elements, the authors demonstrate dynamical switching between topological and trivial phases as well as controllable interactions between topologically protected states. The topological nature of the model is exhibited by direct extraction of the invariants from the measured boundary Green's functions.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/adfbdc94a039a0a0be97eb184b9205c72edb0bed