Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 45: Poster Spins on Surfaces at the Atomic Scale
O 45.8: Poster
Dienstag, 18. März 2025, 18:00–20:00, P2
Investigation of the Yu-Shiba-Rusinov states arising from single Fe atoms on superconducting 2H-NbS2 — •Margarete Huisinga, Werner M.J. van Weerdenburg, Lisa M. Rütten, and Katharina J. Franke — FachbereichPhysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
Magnetic adatoms on a superconductor give rise to states within the superconducting gap due to the interaction of the unpaired spin(s) with the Cooper pairs of the substrate. These so-called Yu-Shiba-Rusinov (YSR) states are therefore isolated from the rest of the electronic structure of the system, which makes them interesting building blocks for artificial molecules or the design of band structures, if the YSR states of multiple atoms hybridize. The YSR states are especially long range on 2D materials, which enables hybridization over a large spacing. Previous experiments on the hybridization of YSR states performed on NbSe2 were limited by a charge density wave [1], which is not present in 2H-NbS2.
Using scanning tunneling microscopy and spectroscopy, we investigate single Fe atoms on superconducting 2H-NbS2. We find that Fe adsorbs in two different adsorption sites on the substrate, each with a distinct set of YSR states. We map the spatial distribution of these YSR states to determine their symmetry and find long-ranged YSR features extending up to 4 nm.
Additionally, we observe a tip-induced shift in the energy of the YSR states for one adsorption site species.
[1] Liebhaber et al. Nat Commun 13, 2160 (2022).
Keywords: STM; Yu Shiba Rusinov states; 2D Materials; Superconductivity; Magnetism