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O: Fachverband Oberflächenphysik
O 101: Ertl Young Investigator Award Competition
O 101.3: Vortrag
Donnerstag, 19. März 2020, 11:30–12:00, TRE Ma
Control of molecular spins on surfaces — •Manuel Gruber — IEAP, Christian-Albrechts-Universität zu Kiel, Germany
Controlling the spin of individual molecules is attractive for molecular spintronics, quantum computing, and may turn useful to study many-body physics in yet unexplored regimes. I will report on three approaches pursued in our group. (i) A direct approach is to employ spin-crossover (SCO) complexes, which exhibit an intrinsic spin bistability. Having first demonstrated SCO of Fe2+ compounds, we recently extended controlled and reversible switching to single Fe3+ complexes on a Cu2N surface. (ii) We integrated a spin switching functionality into robust complexes. It relies on the mechanical movement of an axial ligand strapped to a porphyrin ring. Thus spin and coordination are interlocked and we demonstrate reversible electron-induced switching in this new class of compounds on Ag(111). (iii) Spin is induced in molecules and to some extent controlled through supramolecular manipulation. Spin detection is based on the Yu-Shiba-Rusinov resonances that result from the interaction of the induced spin with Cooper pairs of a superconducting substrate. The induced magnetic moment is fine tuned through the control of the electrostatic potential engendered by neighboring molecules. These experiments notably allow to probe the Yu-Shiba-Rusinov physics caused by fractional charges.
This work has been done in collaboration with the groups of Profs. Berndt, Herges, Rossnagel and Tuczek. Support via SFB 677 and the European Union’s Horizon 2020 research and innovation programme (766726) is acknowledged.