Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 91: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales III
O 91.6: Talk
Thursday, March 21, 2024, 16:30–16:45, MA 041
Gating single-molecule photoluminescence with electrons — •Anna Rosławska1,2, Katharina Kaiser1,3, Michelangelo Romeo1, Fabrice Scheurer1, and Guillaume Schull1 — 1Université de Strasbourg, CNRS, IPCMS, UMR 7504, F-67000 Strasbourg, France — 2Max-Planck-Institut für Festkörperforschung, D-70569, Stuttgart, Germany — 3IV. Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen
The ability to switch an optically-active molecule from a bright to a dark state by modifying its redox state is one of the most striking modifications of optical properties of a chromophore. Here, we show that this mechanism can be applied to a single molecule located in the double barrier tunneling junction of a scanning tunneling microscope (STM). We achieve nearly full tip-enhanced photoluminescence (TEPL) quenching by controlling the population of a transiently charged state by adjusting the tip-molecule distance, the applied bias voltage, and the in-plane position of the tip with respect to the molecule. This versatile gating of the fluorescence yield of a single molecule with sub-nm precision is explained using a straightforward many-body description of our system.
Keywords: STM; tip-enhanced photoluminescence; single-molecule optics; phthalocyanine