Plasmon-exciton strong coupling in single-molecule junction electroluminescence Paoletta, Angela L. Hoffmann, Norah M. Cheng, Daniel W. York, Emma Xu, Ding Zhang, Boyuan Delor, Milan Berkelbach, Timothy C. Venkataraman, Latha ; https://orcid.org/0000-0002-6957-6089 Single molecules bridging two metallic electrodes can emit light through electroluminescence when subjected to a bias voltage. Typically, light emission in such devices results from transitions between molecular states, although in the presence of light-matter coupling, the emission can result from a transition between hybrid light-matter states. Here, we create single metal-molecule-metal junctions and simultaneously collect conductance and electroluminescence data using a scanning tunneling microscope (STM) equipped with a custom spectrometer. Through experimental analysis and electronic structure calculations, we provide evidence for a molecule-electrode interfacial exciton coupled to a junction cavity plasmon. Importantly, we find that close to resonant transport conditions, the molecular junction functions as a single emitter that is strongly coupled to the junction cavity mode, leading to characteristic Rabi splitting of the emission spectrum and providing the first example of an electroluminescence-driven single-molecule system in the regime of strong light-matter coupling. American Chemical Society 2024 info:eu-repo/semantics/article doc-type:Article Article http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/20529 Paoletta AL, Hoffmann NM, Cheng DW, et al. Plasmon-exciton strong coupling in single-molecule junction electroluminescence. <i>Journal of the American Chemical Society</i>. 2024;146(50):34394-34400. doi:<a href="https://doi.org/10.1021/jacs.4c09782">10.1021/jacs.4c09782</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1021/jacs.4c09782 info:eu-repo/semantics/altIdentifier/issn/0002-7863 info:eu-repo/semantics/altIdentifier/e-issn/1520-5126 info:eu-repo/semantics/altIdentifier/pmid/39630979 info:eu-repo/semantics/closedAccess