Berlin 2024 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 43: Optical Properties II
HL 43.5: Vortrag
Donnerstag, 21. März 2024, 10:45–11:00, EW 561
Organic room-temperature polariton condensate in a higher-order topological lattice — •Christoph Bennenhei1, Hangyong Shan1, Marti Struve1, Nils Kunte1, Falk Eilenberger2, Jürgen Ohmer3, Utz Fischer3, Xuekai Ma4, Christian Schneider1, and Martin Esmann1 — 1Institute of Physics, Universität Oldenburg, Germany — 2Fraunhofer-Institute for Applied Optics and Precision Engineering IOF, Jena, Germany — 3Department of Biochemistry, Universität Würzburg, Germany — 4Department of Physics, Paderborn University, Germany
Organic molecule exciton-polaritons in artificial photonic lattices have emerged as a versatile platform to emulate unconventional phases of matter at ambient conditions, including protected interface modes in topological insulators [1]. We investigate bosonic condensation in the most prototypical higher-order topological lattice, a 2D-version of the Su-Schrieffer-Heeger (SSH) model, which supports both zero- and one-dimensional topological defect modes. Using spatially resolved photoluminescence spectroscopy, we observe the topological defect modes of fluorescent protein-filled distributed Bragg reflector cavities with a fabricated lattice of hemispherical indentations defining a staggered photonic trapping potential. We observe bosonic condensation into topologically protected interface modes and demonstrate spatial first-order coherence in the protected 1D channels via interferometric measurements. Our findings pave the way towards organic on-chip polaritonics using higher-order topology as a tool for the generation of robustly confined lasing states. [1] Nano Lett. 2021, 21, 15, 6398-6405
Keywords: polariton; microcavity; bosonic condensation; Su-Schrieffer-Heeger; higher-order topological insulator