Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 42: 2D Materials III: Electronic Structure (joint session O/TT)
TT 42.5: Vortrag
Mittwoch, 20. März 2024, 11:30–11:45, MA 005
Self-hybridized exciton-polaritons in thin films of Ruddlesden-Popper-Perovskites — •Maximilian Black1, Parsa Darman2, Sara Darbari2, and Nahid Talebi1 — 1Institute for Experimental and Applied Physics, Kiel University, 24118 Kiel, Germany — 2Faculty of Electrical and Computer Engineering, Tarbiat Modares University, 14115-111 Tehran, Iran
Lead halide perovskites have emerged as platforms for exciton-polaritonic studies at room temperature thanks to their excellent photoluminescence efficiency and great synthetic versatility. In this work we find proof of strong exciton-photon coupling in cavities formed by the layered crystals themselves, a phenomenon known as self-hybridization effect. We use multi-layers of high quality Ruddlesden-Popper perovskites in their 2D crystalline form, benefiting from their quantum-well excitonic resonances and the strong Fabry-Perot resonances resulting from the total-internal-reflection at their smooth surfaces. Optical spectroscopy reveals bending of the cavity modes typical for exciton-polariton formation, and photoluminescence spectroscopy shows thickness dependent splitting of the excitonic resonance. Additionally, local optical excitation of the flakes in photoluminescence measurements unveils long in-plane propagation of the excited modes. In previous works the influence of the incident angle is often overlooked, motivating this work to focus on tuning the in-plane momentum of the incident light to the polaritonic resonances. We therefore pave the way towards an effective way to study the rich physics of exciton-polaritons in Ruddlesden-Popper 2D perovskites.
Keywords: 2D perovskites; excitons; polaritons; photoluminescence spectroscopy; optical spectroscopy