SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Topological Insulators
TT 36.6: Vortrag
Mittwoch, 29. März 2023, 16:30–16:45, HSZ 103
PT-symmetric photonic topological insulator — •Alexander Fritzsche1,2, Tobias Biesenthal2, Lukas Maczewsky2, Karolin Becker2, Max Erhardt2, Matthias Heinrich2, Ronny Thomale1, Yogesh Joglekar3, and Alexander Szameit2 — 1Fakultät für Physik und Astronomie, Julius-Maximilians-Universität Würzburg, Würzburg, Germany — 2Institut für Physik, University of Rostock, Rostock, Germany — 3Department of Physics, Indiana University-Purdue University Indianapolis (IUPUI), Indianapolis, Indiana, USA
Gain and loss are characteristic features of open or non-Hermitian systems and lead, in general, to instable, exponentially increasing and decreasing states. However, these instabilities can be avoided when parity-time (PT) symmetry is added to such arrangements. Because of its unique properties it has been tried to combine PT symmetry with the unrivalled robustness of transport in topological insulators. In this work we propose and experimentally realize a periodically driven topological insulator with two counterpropagating boundary states where gain and loss are distributed not only spatially but also temporally using photonic waveguides as the experimental platform. Here, the periodic driving allows us to circumvent the problems that have so far hindered the combination of PT symmetry and topological insulators thereby providing the missing link between these two realms.