Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 49: Topolectric Circuits and Quantum Hall Systems

TT 49.4: Vortrag

Mittwoch, 18. März 2020, 18:00–18:15, HSZ 103

Observation of the non-Hermitian skin effect in topolectric circuits — •Tobias Hofmann1, Tobias Helbig1, Stefan Imhof2, Tobias Kießling2, Ching Hua Lee3, 4, Martin Greiter1, and Ronny Thomale11Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg — 2Physikalisches Institut und Röntgen Research Center for Complex Material Systems, Universität Würzburg, 97074 Würzburg — 3Department of Physics, National University of Singapore, Singapore, 117542 — 4Institute of High Performance Computing, A*STAR, Singapore, 138632

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). In Hermitian systems energy eigenvalues and eigenstates exhibit a perturbatively small change as the boundary conditions are modified from periodic to open. The framework of BBC captures the emergence of protected surface states at the boundary of a system with nontrivial 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 and result in the non-Hermitian Skin effect: upon switching from periodic to open boundary conditions, the spectrum changes drastically and all eigenstates localize at one boundary. We experimentally observe this phenomenon for the first time.

[1] T. Helbig et al., arXiv:1907.11562 (2019)

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