Regensburg 2025 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 6: Focus Session Many-Body Phenomena in Nanomagnets: Kondo, Spinons, Spinarons and Beyond (joint session O/TT)
TT 6.1: Hauptvortrag
Montag, 17. März 2025, 15:00–15:30, H24
Kondo and Yu-Shiba-Rusinov resonances: transport and coupling — •Laëtitia Farinacci1,2,3, Gelavizh Ahmadi3, Gaël Reecht3, Benjamin W. Heinrich3, Contanstin Czekelius3, Felix von Oppen3, and Katharina J. Franke3 — 1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, Stuttgart, Germany — 2Carl-Zeiss-Stiftung Center for Quantum Photonics Jena-Stuttgart-Ulm, Germany — 3Fachbereich Physik, Freie Universität Berlin, Germany
The exchange coupling between a magnetic impurity and a superconducting substrate leads to the formation of magnetic bound states, known as Yu-Shiba-Rusinov (YSR) states, inside the superconducting gap, as well as a Kondo resonance outside the gap. Studying these two many-body phenomena in parallel provides valuable insights into their characteristic properties.
We observed striking correlations between the asymmetries of the YSR state and the Kondo effect induced by FeTPyP molecules on Pb(111) in a scanning tunneling microscope (STM) [1]. We show that both asymmetries originate from interfering tunneling paths via a spin-carrying orbital and the highest occupied molecular orbital.
Additionally, we studied the formation of YSR bands in a self-assembled kagome lattice of magnetic molecules on Pb(111) and track YSR hybridization from kagome precursors to larger islands [2]. This work will motivate further studies to resolve possible spin-liquid or Kondo-lattice-type behavior.
[1] PRL 125, 256805 (2020). [2] Nat. Comm. 15, 6474 (2024).
Keywords: Kondo resonance; Yu-Shiba-Rusinov states; Scanning Tunneling Microscopy; Scanning Tunneling Spectroscopy