Dresden 2020 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.39: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P3

Detecting an Electron Transfer Reaction in the Single-Molecule Regime Using a Diamond-Based Quantum Sensor — •Jan-Magnus Kurzhals, René Wieczorek, and Wolfgang Harneit — Universität Osnabrück

NV center-assisted optically detected magnetic resonance measurements are used to address the electrochemical behaviour of few neutral EPR-silent transition metal complex molecules, namely nickel bis(diphenyldithiolene), onto an oxygen-terminated diamond surface. By employing a nearby located NV center quantum sensor we gain strong evidence of a reduction process occurring on the nickel complex which we ascribe to an electron transfer from the diamond substrate. Both, Hahn echo spin locking and double electron electron resonance quantum sensing protocols, certify that our experiments probe the single-molecule regime where thermal polarization is overcome. Our insights into the nature of the electron transfer reaction are supported by quantum chemical calculations.