Dresden 2026 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 62: Correlated Electrons – Poster II
TT 62.9: Poster
Wednesday, March 11, 2026, 15:00–17:00, P4
The Fate of Kondo Correlations in Superconducting Magnetic Impurities beyond Mean Field — •Kilian Münz1, Björn Kubala1,2, Christian Ast3, Joachim Ankerhold1, and Ciprian Padurariu1 — 1Institute for Complex Quantum Systems and IQST, Ulm University, Ulm, Germany — 2German Aerospace Center (DLR), Institute for Quantum Technologies, Ulm, Germany — 3Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany
The interplay between strong electronic correlations (Kondo effect) and superconductivity is of fundamental interest in mesoscopic physics. We investigate the superconducting single-impurity Anderson model (SIAM) with Numerical Renormalization Group methods using the NRG Ljubljana code [1]. Calculations confirm the expected emergence of Yu-Shiba-Rusinov (YSR) states within the superconducting gap.
Simulations also yield the tails of the renormalized Kondo density of states extending above the gap. We demonstrate that these above-gap features translate directly into additional contributions in the tunneling current measured by scanning tunneling microscopy. Crucially, these Kondo-rooted spectral signatures exhibit a discontinuous change across the quantum phase transition of the superconducting SIAM. These NRG predictions show excellent qualitative agreement with recent experimental results from MPI-FKF Stuttgart.
[1] Žitko, Rok: NRG Ljubljana. DOI: 10.5281/ZENODO.4841076.
Keywords: Yu-Shiba-Rusinov (YSR) States; Kondo Physics; Scanning Tunneling Microscopy; Numerical Renormalization Group (NRG)