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TT: Fachverband Tiefe Temperaturen
TT 85: Superconductivity: Yu-Shiba-Rusinov and Andreev Physics
TT 85.5: Vortrag
Donnerstag, 12. März 2026, 16:00–16:15, CHE/0089
Analytical and ab-initio characterization of YSR-state binding energies under magnetic-moment misalignment — •Ilias Klepetsanis1,2 and Samir Lounis3 — 1Forschungszentrum Jülich & JARA, Germany — 2University of Duisburg-Essen and CENIDE, Germany — 3Martin-Luther University Halle-Wittenberg, Institut für Physik and Halle-Berlin-Regensburg Cluster of Excellence CCE Halle, Germany
Complex spin textures interfaced with superconducting surfaces give rise to a rich variety of phenomena, ranging from the emergence of intricate in-gap states –such as Yu-Shiba-Rusinov (YSR) states– to the realization of topological superconductivity hosting Majorana modes. At the core of these effects lie competing and intertwined interactions involving Cooper pairing, spin-spin coupling, and spin-orbit-driven mechanisms. In this work, we systematically and analytically identify how the binding energies of YSR states in atomic nanostructures depend on the orientation of their magnetic moments. We distinguish between different underlying mechanisms, including those that are independent of spin-orbit coupling (SOC) and those that arise from SOC-driven magnetic misalignment. Results obtained using an Anderson-impurity model coupled to the Bogoliubov-de Gennes (BdG) formalism are compared with both DFT-BdG calculations for Fe nanostructures on a superconducting BiAg2 surface and available scanning tunnelling microscopy measurements.
– We acknowledge funding by the DFG (LO 1659/11-1; Cluster of Excellence Center for Chiral Electronics -EXC3112/1 -533767171).
Keywords: Superconductivity; Complex magnetism; YSR states; DFT; Bogoliubov-de-Gennes