Experimental observation of non-Hermitian higher-order skin interface states in topological electric circuits

Abstract

The study of topological states has developed rapidly in electric circuits, which permits flexible fabrications of non-Hermitian systems by introducing non-Hermitian terms. Here, nonreciprocal coupling terms are realized by utilizing a voltage follower module in non-Hermitian topological electric circuits. We report the experimental realization of one- and two- dimensional non-Hermitian skin interface states in electric circuits, where interface states induced by non-Hermitian skin effects are localized at the interface of different domains carrying different winding numbers. Our electric circuit system provides a readily accessible platform to explore non-Hermitian-induced topological phases, and paves a new road for device applications.

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• Engineering topological states and quantum-inspired information processing using classical circuits
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• Anomalous pumping in the non-Hermitian Rice-Mele model
• Unconventional and robust light-matter interactions based on the non-Hermitian skin effect
• Controlled probing of localization effects in the non-Hermitian Aubry-André model via topolectrical circuits
• Boundary-driven many-body phase transitions in a non-Hermitian disordered fermionic chain
• Anomalous spectrum in a non-Hermitian quasiperiodic chain
• Hinge non-Hermitian skin effect in the single-particle properties of a strongly correlated f-electron system
• Meissner effect in non-Hermitian superconductors
• Concurrent Skin-scale-free Localization and Criticality under Möbius Boundary Conditions in a Non-Hermitian Ladder
• Non-Hermitian wave-packet dynamics and its realization within a non-Hermitian chiral cavity
• Exceptional flat bands in bipartite non-Hermitian lattices
• Antiferromagnetism and spin excitations in a two-dimensional non-Hermitian Hatano-Nelson flux model