Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 70: Poster: Spins on Surfaces & Surface Magnetism
O 70.8: Poster
Mittwoch, 20. März 2024, 18:00–20:00, Poster C
Chiral hybridization of Yu-Shiba-Rusinov states in Fe clusters on Pb(111) — •Bharti Mahendru1, Léa Meynier1, Lisa M. Rütten1, Harald Schmid1, Felix von Oppen1,2, and Katharina J. Franke1 — 1Fachbereich Physik, Freie Universität Berlin, Berlin, Germany — 2Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Berlin, Germany
Unpaired electron spins exchange coupled to a superconductor give rise to bound states inside the superconducting energy gap, so-called Yu-Shiba-Rusinov (YSR) states. Scanning tunneling microscopy and spectroscopy (STM/STS) are powerful tools to probe the excited state around the Fermi level of such systems at the atomic scale. Previously, it has been shown that the crystal field splits the d-levels of Mn atoms on Pb surfaces, which lead to distinct YSR states inheriting the symmetry of the spin-carrying orbital. Here, we investigate self-assembled clusters of Fe on Pb(111) using STM/STS. Single Fe atoms, although having four unpaired electrons in the d-levels in gas phase, do not show YSR states on Pb(111) surface. In contrast, we observe different clusters, all showing in-gap states. These YSR states exhibit different symmetries that are related to the structure of the cluster on the Pb(111) surface. Interestingly, one type of the cluster exhibits spatially chiral YSR wavefunctions in differential conductance (dI/dV) maps. Using a simple model, we find that the origin of this chirality results from the adsorption of Fe atoms in the three-fold symmetric hollow sites of the substrate and the extent of the YSR wavefunctions.
Keywords: YSR States; chiral structures; STM/STS