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Observation of the non-Hermitian Skin effect in topolectric circuits

ORAL

Abstract

A contemporary frontier of metamaterial research is the challenge non-Hermitian systems pose to the established characterization of topological matter. There, one of the most relied upon principles is the bulk-boundary correspondence (BBC): energy eigenvalues and eigenstates exhibit a perturbatively small change as the boundary conditions are modified from periodic to open by changing a single bond. The framework of BBC captures the emergence of protected surface states at the boundary of a system with non-trivial bulk topology. In this talk, we present a periodic circuit network, where gain and loss conspire with the violation of reciprocity to affect this principle dramatically. Switching from periodic to open boundary conditions results in a non-perturbative change of all eigenmodes in this system. We experimentally observe the non-Hermitian Skin effect with extensive mode localization at open boundaries for the first time.

Reference: T. Helbig, et al. arXiv:1907.11562 (2019).

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Presenters

  • Tobias Helbig

    Theoretical physics I, University of Wuerzburg, Institute for Theoretical Physics and Astrophysics, University of Wurzburg, University of Wurzburg

Authors

  • Tobias Helbig

    Theoretical physics I, University of Wuerzburg, Institute for Theoretical Physics and Astrophysics, University of Wurzburg, University of Wurzburg

  • Tobias Hofmann

    Theoretical physics I, University of Wuerzburg, Institute for Theoretical Physics and Astrophysics, University of Wurzburg, University of Wurzburg

  • Ching Hua Lee

    Department of Physics, National University of Singapore, National University of Singapore

  • Martin Greiter

    Institute for Theoretical Physics and Astrophysics, University of Wurzburg, University of Wurzburg

  • Ronny Thomale

    University of Wurzburg, Institute for Theoretical Physics, University of Wuerzburg, Theoretical physics I, University of Wuerzburg, University of Wuerzburg, Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Physics department, University of Wuerzburg, Institut für Theoretische Physik und Astrophysik, University of Würzburg, Institute for Theoretical Physics and Astrophysics, University of Wurzburg