Bonn 2025 – scientific programme

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SYPE: Symposium Polaritonic Effects in Molecular Systems

SYPE 1: Polaritonic Effects in Molecular Systems

SYPE 1.2: Invited Talk

Tuesday, March 11, 2025, 11:30–12:00, HS 1+2

Ultrafast coherent exciton dynamics mediated by field-matter couplings — •Antonietta De Sio — Institut für Physik, Carl von Ossietzky Universität Oldenburg

Coupling electromagnetic radiation with matter is highly promising for tailoring optoelectronic and transport properties of functional materials, with potential applications ranging from photovoltaics to nanophotonics and quantum technologies. The underlying processes involve a complex interplay of electronic, vibrational, and photonic degrees of freedom and occur on ultrashort, few 100s-fs timescales, thus demanding techniques combining high time resolution and the ability to unravel couplings. Here, we present some recent results using broadband two-dimensional electronic spectroscopy to probe couplings and track their quantum dynamics. In halide perovskites, we demonstrate intra-exciton population oscillations driven by coherent phonon fields which behave essentially as arising from the coupling of excitons to a field mode in an off-resonant cavity [1]. In molecular aggregates deposited on a gold nanoslit array, where molecular excitons are collectively coupled to a spatially structured plasmonic field, we observe coherent oscillations due to plasmon-induced coherent exciton population transfer over mesoscopic distances [2]. Our results suggest strategies for controlling ultrafast coherent dynamics in functional materials. [1] Nguyen et al, Nature Comm. 14, 1047 (2023); [2] Timmer et al, Nature Commun. 14, 8035 (2023).