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O: Fachverband Oberflächenphysik
O 7: Spins on Surfaces at the Atomic Scale I
O 7.4: Vortrag
Montag, 27. März 2023, 11:30–11:45, REC C 213
Symmetry-dependent coupling in Yu-Shiba-Rusinov dimers — •Lisa Rütten1, Eva Liebhaber1, Harald Schmid1, Gaël Reecht1, Kai Rossnagel2,3, Felix von Oppen1, and Katharina Franke1 — 1Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24118 Kiel, Germany — 3Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
Unpaired adatom spins on superconductors interact with the Cooper pairs of the substrate and cause Yu-Shiba-Rusinov (YSR) states inside the superconducting gap. These can be probed by scanning tunneling spectroscopy at the single-atom scale. On superconducting van der Waals materials, the YSR wave functions of magnetic impurities can extend over several nanometers. This provides a wide range of adatom spacings over which their interaction is sufficiently strong to be potentially observed as a splitting in the tunneling spectra. Additionally, the YSR wave functions inherit their symmetry from the substrate. Depending on the symmetry and spacing in YSR dimers, the spins may interact differently via RKKY and Dzyaloshinskii-Moriya interactions. This manifests in splittings and/or shifts of the YSR states.
Here, we manipulate Fe atoms on superconducting 2H-NbSe2 using the tip of a scanning tunneling microscope and build dimers with different symmetries. Depending on the orientation of the dimers with respect to the crystal symmetry of the substrate we find YSR hybridization but also more complex effects caused by spin interactions.