biostudies-literatureUnknown12(1)Zou DRobust boundary states epitomize how deep physics can give rise to concrete experimental signatures with technological promise. Of late, much attention has focused on two distinct mechanisms for boundary robustness-topological protection, as well as the non-Hermitian skin effect. In this work, we report the experimental realizations of hybrid higher-order skin-topological effect, in which the skin effect selectively acts only on the topological boundary modes, not the bulk modes. Our experiments, which are performed on specially designed non-reciprocal 2D and 3D topolectrical circuit lattices, showcases how non-reciprocal pumping and topological localization dynamically interplays to form various states like 2D skin-topological, 3D skin-topological-topological hybrid states, as well as 2D Nature communications7201https://www.ebi.ac.uk/biostudies/studies/S-EPMC8664810biostudies-literatureObservation of hybrid higher-order skin-topological effect in non-Hermitian topolectrical circuits.PMC8664810Lee CHBao JHe WZhang XZou DSun HChen TfalseObservation of hybrid higher-order skin-topological effect in non-Hermitian topolectrical circuits.Robust boundary states epitomize how deep physics can give rise to concrete experimental signatures with technological promise. Of late, much attention has focused on two distinct mechanisms for boundary robustness-topological protection, as well as the non-Hermitian skin effect. In this work, we report the experimental realizations of hybrid higher-order skin-topological effect, in which the skin effect selectively acts only on the topological boundary modes, not the bulk modes. Our experiments, which are performed on specially designed non-reciprocal 2D and 3D topolectrical circuit lattices, showcases how non-reciprocal pumping and topological localization dynamically interplays to form various states like 2D skin-topological, 3D skin-topological-topological hybrid states, as well as 2D 2021-01-01T00:00:00Z2021 Dec2025-04-04T20:35:18.071Z2025-04-04T20:35:18.071ZS-EPMC86648103489358910.1038/s41467-021-26414-5