SKM 2023 – scientific programme
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O: Fachverband Oberflächenphysik
O 2: Organic Molecules on Inorganic Substrates I: Electronic, Optical and Other Properties I
O 2.6: Talk
Monday, March 27, 2023, 11:45–12:00, CHE 89
STM-induced luminescence from single graphene nanoribbons — •Song Jiang1, Tomáš Neuman1,2, Alex Boeglin1, Fabrice Scheurer1, and Guillaume Schull1 — 1Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France — 2Institut des Sciences Moléculaires d’Orsay (ISMO), UMR 8214, CNRS, Université Paris-Saclay, 91405 Orsay Cedex, France
Graphene nanoribbons (GNRs) have emerged as promising candidates for high-performance nanoelectronic devices due to their tunable energy band gaps resulting from lateral quantum confinement and edge effects. The recent development of on-surface synthesis has achieved various types of atomically precise GNRs, revealing fascinating electronic, magnetic, and mechanical properties. Their optical properties, on the other hand, remain largely unexplored. The intrinsic luminescence properties of atomically precise GNR remains remain to be addressed at single molecule level. Here, excitonic emission from atomically precise GNRs synthesized on a metal surface is probed using a scanning tunneling microscopy (STM) approach. A STM-based strategy to transfer the GNRs to a partially insulating surface is used to prevent light emission quenching of the ribbons by the metal substrate. Sub-nanometer resolved STM-induced fluorescence spectra reveal emission from localized dark excitons build upon the topological end states of the GNRs accompanying with a series of vibronic peaks. Our study provides a novel path to investigate the interplay between excitons, vibrons and topology in atomically precise graphene nanostructures.