# Observation of bulk boundary correspondence breakdown in topolectrical circuits

@inproceedings{Helbig2019ObservationOB, title={Observation of bulk boundary correspondence breakdown in topolectrical circuits}, author={Tobias Helbig and Tobias Hofmann and Stefan Imhof and Mohamed Abdelghany and Tobias Kie{\ss}ling and Laurens W. Molenkamp and Ching Hua Lee and Alexander Szameit and Martin Greiter and Ronny Thomale}, year={2019} }

The study of the laws of nature has traditionally been pursued in the limit of isolated systems, where energy is conserved. This is not always a valid approximation, however, as the inclusion of features like gain and loss, or periodic driving, qualitatively amends these laws. A contemporary frontier of meta-material research is the challenge open systems pose to the established characterization of topological matter1, 2. There, one of the most relied upon principles is the bulk-boundary…

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