Experimental Observation of Topological Disclination States in Lossy Electric Circuits

TL;DR

This paper experimentally demonstrates topological disclination states in lossy electric circuits, showing localized voltage responses and fractional charges at disclination sites, driven solely by gain and loss mechanisms.

Contribution

It provides the first experimental evidence of gain-loss-induced topological disclination states in electric circuits, confirming theoretical predictions.

Findings

Localized voltage response at disclination sites

Robustness of states against disorder

Detection of fractional charge at disclination sites

Abstract

Topological phase transitions can be remarkably induced purely by manipulating gain and loss mechanisms, offering a novel approach to engineering topological properties. Recent theoretical studies have revealed gain-loss-induced topological disclination states, along with the associated fractional charge trapped at the disclination sites. Here, we present the experimental demonstration of topological disclination states in a purely lossy electric circuit. By designing alternating lossy electric circuit networks that correspond to the disclination lattice, we observe a voltage response localized at the disclination sites and demonstrate the robustness of these states against disorder. Furthermore, we measure the charge distribution, confirming the presence of fractional charge at the disclination sites, which gives rise to the topological disclination states. Our experiment provides direct evidence of gain-loss-induced topological disclination states in electric circuits, opening new possibilities for applications in classical systems.