Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 24: Poster II
Q 24.4: Poster
Dienstag, 12. März 2024, 17:00–19:00, KG I Foyer
Observation of topological edge states of photons by controlled coupling to the environment — •Nikolas Longen1, Helene Wetter2, Michael Fleischhauer3, Stefan Linden2, and Julian Schmitt1 — 1Institut für Angewandte Physik, Universität Bonn, Wegelerstr. 8, 53115 Bonn, Germany — 2Physikalisches Institut, Universität Bonn, Nussallee 12, 53115 Bonn, Germany — 3Fachbereich Physik, RPTU Kaiserslautern-Landau, Erwin-Schrödinger Str. 46, 67663 Kaiserslautern, Germany
Topology is an important paradigm for our understanding of phases of matter in condensed matter, cold atoms and photonic systems. Here we present a new approach to realize topological states, which result from coupling the system to an environment. In a proof-of-principle study, we first eperimentally demonstrate open-system topological states using a plasmon-polariton waveguide plattform. The underlying, a priori topologically trivial lattice consists of a unit cell of four lattice sites which is equipped with spatially varied losses leading to a topological band structure. By tuning the hopping and the dissipation in the waveguide system, we observe both the emergence and the breakdown of a localized topological edge state. Moreoever, we present ongoing work, in which we develop an experimental platform to study non-Hermitian topological states in lattices of photon Bose-Einstein condensates within a dye-filled optical microcavity. The coupling to the reservoir of dye molecules here allows for gain, thermalization and tunable coherence properties of the photons, opening new pathways for the exploration of topological states in open systems.
Keywords: Bose-Einstein Condensation; Photon condensation; Topological Systems; Open quantum systems