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O: Fachverband Oberflächenphysik

O 2: Heterostructures, interfaces and surfaces (joint session HL/O)

O 2.6: Hauptvortrag

Montag, 16. März 2020, 11:15–11:45, POT 151

Exciton-Polariton Topological Insulator — •Sebastian Klembt — Technische Physik, Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, and Würzburg-Dresden Cluster of Excellence ct.qmat, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

Topological insulators (TIs) constitute a striking example of materials in which topological invariants are manifested in robustness against perturbations. The most striking characteristic is the emergence of topological edge states at the interface between areas with distinct topological invariants. The observable physical effect is unidirectional, robust edge transport, immune to disorder or defects. TIs have at first been observed in the integer quantum Hall effect in fermionic systems of correlated electrons. However, during the past decade the concepts of topological physics have been introduced into numerous fields beyond condensed matter, including photonic systems. Recently, TIs were proposed in exciton-polariton systems organized as honeycomb lattices, under the influence of a magnetic field. Exciton-polaritons are the new eigenstate quasiparticles resulting from the strong coupling of quantum well excitons to light in an optical microcavity mode. Here, we demonstrate experimentally the first exciton-polariton TI and as such the first symbiotic light-matter TI. In polaritonic honeycomb lattices, we show the existence of a C = 2 Chern TI, manifesting in a chiral, topologically protected edge mode. Notably, due to the driven-dissipative nature of polaritons this is an open system, with a strong non-linearity still preserving the topological mode.