Regensburg 2025 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 15: Focus Session Many-Body Phenomena in Nanomagnets: Kondo, Spinons, Spinarons and Beyond (joint session O/TT)
O 15.8: Vortrag
Montag, 17. März 2025, 18:00–18:15, H24
Theoretical model for multiorbital Kondo screening in strongly correlated molecules with several unpaired electrons — •Manish Kumar1, Aitor Calvo-Fernandez2, Diego Solar-Polo1, Asier Eiguren2, Maria Blanco-Rey3, and Pavel Jelinek1 — 1Institute of Physics, Academy of Sciences of the Czech Republic , Cukrovarnicka 10, Prague 6, CZ 16200, Czech Republic — 2Department of Physics, University of the Basque Country UPV-EHU, 48080 Leioa, Spain — 3Department of Polymers and Advanced Materials: Physics, Chemistry and Technology, University of the Basque Country UPV-EHU, 20018 Donostia-San Sebastián, Spain
The mechanism of Kondo screening in strongly correlated molecules with several unpaired electrons on a metal surface is still under debate. Here, we provide a theoretical framework that rationalizes the emergence of Kondo screening involving several extended molecular orbitals with unpaired electrons. We introduce a perturbative model, which provides simple rules to identify the presence of antiferromagnetic spin-flip channels involving charged molecular multiplets responsible for Kondo screening. The Kondo regime is confirmed by numerical renormalization group calculations. In addition, we introduce the concept of Kondo orbitals as molecular orbitals associated with the Kondo screening process, which provide a direct interpretation of experimental dI/dV maps of Kondo resonances. We demonstrate that this theoretical framework can be applied to different strongly correlated open-shell molecules on metal surfaces, obtaining good agreement with previously published experimental data.
Keywords: Many-body Physics; Kondo Screening; Numerical Remornalization Group; Anderson Model; Spinons