Experimental realization of loss-induced quadrupole topology from a gapped trivial insulator in RLC circuits
Abstract
Non-Hermitian topological transitions offer a route to controlling topology through dissipation, but their experimental signatures depend on how loss modifies the system's response. Here, we experimentally realize loss-induced quadrupole topology in a square-octagon RLC circuit whose ideal Hermitian limit is a gapped trivial insulator. Patterned grounding resistors introduce on-site loss while the conservative couplings remain fixed. Band spectra and biorthogonal nested Wilson loops identify a loss-driven topological transition accompanied by closure and reopening of the real line gap. Impedance spectroscopy and spatial maps reveal corner-localized responses consistent with the predicted quadrupole phase. Comparing two finite-loss configurations, we observe enhanced corner contrast at stronger patterned loss within the same predicted phase. These results connect dissipation-driven topology to observable boundary responses in RLC circuits.
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BibTeX
@misc{he2026experimental,
title = {{Experimental realization of loss-induced quadrupole topology from a gapped trivial insulator in RLC circuits}},
author = {Wenxue He and Chen Wang and Fan Yang and Hechen Ren},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.02435},
eprint = {2611.02435},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.02435},
}
RIS
TY - UNPB
TI - Experimental realization of loss-induced quadrupole topology from a gapped trivial insulator in RLC circuits
AU - Wenxue He
AU - Chen Wang
AU - Fan Yang
AU - Hechen Ren
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2611.02435
UR - https://arxiv.org/abs/2611.02435
AB - Non-Hermitian topological transitions offer a route to controlling topology through dissipation, but their experimental signatures depend on how loss modifies the system's response. Here, we experimentally realize loss-induced quadrupole topology in a square-octagon RLC circuit whose ideal Hermitian limit is a gapped trivial insulator. Patterned grounding resistors introduce on-site loss while the conservative couplings remain fixed. Band spectra and biorthogonal nested Wilson loops identify a loss-driven topological transition accompanied by closure and reopening of the real line gap. Impedance spectroscopy and spatial maps reveal corner-localized responses consistent with the predicted quadrupole phase. Comparing two finite-loss configurations, we observe enhanced corner contrast at stronger patterned loss within the same predicted phase. These results connect dissipation-driven topology to observable boundary responses in RLC circuits.
ER -