Berlin 2024 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 70: Poster: Spins on Surfaces & Surface Magnetism
O 70.7: Poster
Wednesday, March 20, 2024, 18:00–20:00, Poster C
Controlling hybridization in Yu-Shiba-Rusinov dimers through a charge-density wave — •Lisa M. Rütten1, Eva Liebhaber1, Kai Rossnagel2,3, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, Germany — 2Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany — 3Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
Unpaired adatom spins on superconductors interact with the Cooper pairs of the substrate and induce Yu-Shiba-Rusinov (YSR) states inside the superconducting gap. These states can be probed by scanning tunneling spectroscopy at the single-atom scale. In quasi-two-dimensional materials, the YSR wave functions extend over several nanometers. If the YSR wave functions of two impurities overlap they can hybridize which is observed as a splitting of YSR resonances in tunneling spectra. Additionally, the YSR states are influenced by the presence of a charge-density wave (CDW). Fe atoms on 2H-NbSe2 have been shown to exhibit long-range YSR wave functions, where the energies, at which the YSR resonances are observed, depend strongly on the atoms position with respect to the CDW.
Here, we use lateral manipulation to arrange Fe atoms on 2H-NbSe2. While an isolated atom hardly influences the CDW, a set of atoms may impact its incommensurate pattern. We build a dimer of Fe atoms and then rearrange additional atoms around it to modify the CDW. We show that the hybridization strength can be switched as the underlying CDW is changed.
Keywords: superconductivity; NbSe2; Yu-Shiba-Rusinov; charge-density wave; scanning tunneling microscopy