SKM 2021 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 16: PhD Focus Session: Symposium on Strange Bedfellows - Magnetism Meets Superconductivity" (joint session MA/AKjDPG) (joint session MA/TT)
TT 16.3: Invited Talk
Thursday, September 30, 2021, 10:45–11:15, H5
Magnetic adatom chains on superconducting NbSe2 — Eva Liebhaber1, Lisa M. Rütten1, Gael Reecht1, Jacob F. Steiner2, Sebastian Rohlf3, Kai Rossnagel3, Felix von Oppen2, and •Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, Germany — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Germany — 3Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany
Magnetic adatom chains on superconducting substrates constitute a fascinating platform to study the interplay of quantum magnetism and superconductivity. Here, we investigate magnetic adatom chains in the dilute limit. This means that the atoms are sufficiently far spaced that direct hybridization of their d orbitals is negligible, but close enough for sizeable substrate-mediated interactions. We build these chains from individual Fe atoms on a 2H-NbSe2 substrate. Using scanning tunneling microscopy and spectroscopy we first characterize the exchange coupling between the magnetic adatoms and the superconductor by detecting their Yu-Shiba-Rusinov states within the superconducting energy gap. We then use the tip of the STM to assemble dimers, trimers and chains of these Fe atoms. In each step, we track the evolution of the Yu-Shiba-Rusinov states and identify magnetic interactions, hybridization and band formation.