Emergent Relativistic Effects in Condensed Matter
From Fundamental Aspects to Electronic Functionality

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23.07.2021

Atomically resolved single-molecule triplet quenching


J. Peng, S. Sokolov, D. Hernangómez-Pérez, F. Evers, L. Gross, J.M. Lupton, J. Repp

Science

The nonequilibrium triplet state of molecules plays an important role in photocatalysis, organic photovoltaics, and photodynamic therapy. We report the direct measurement of the triplet lifetime of an individual pentacene molecule on an insulating surface with atomic resolution by introducing an electronic pump-probe method in atomic force microscopy. Strong quenching of the  triplet lifetime is observed if oxygen molecules are coadsorbed in close proximity. By means of single-molecule manipulation  techniques, different arrangements with oxygen molecules were created and characterized with atomic precision, allowing for the direct correlation of molecular arrangements with the lifetime of the quenched triplet. Such electrical addressing of long-lived triplets of single molecules, combined with atomic-scale manipulation, offers previously unexplored routes to control and study local spin-spin interactions.
 

https://science.sciencemag.org/content/373/6553/452

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