Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 21: Surface magnetism – Poster

O 21.1: Poster

Montag, 9. März 2026, 18:00–20:00, P2

Quantum confinement of spinarons in quantum corrals. — •Raffaele Aliberti¹, Juba Bouaziz², Ilias Klepetsans², and Samir Luonis¹ — ¹Institute of Physics, Martin-Luther- University Halle-Wittenberg, Germany — ²Peter Grünberg Institut, Forschungszentrum Jülich and JARA, Germany

For more than two decades, cobalt atoms on noble-metal (111) sur-faces have served as a paradigm for the Kondo effect in scanning tun-nelling spectroscopy (STS) experiments. However, our recent first-principles predictions, supported by high-magnetic-field STS mea-surements, challenge this established view. We showed that the observed transport anomalies originate instead from spin excitations of Co atoms forming a distinct many-body state, the spinaron, which is a polaronic quasiparticle arising from the interaction between an excited magnetic moment and a trapped surface electron. Here, using time-dependent DFT combined with many-body perturbation theory, we investigate quantum-confinement engineering in circular and elliptical quantum corrals hosting a single Co adatom, revisiting the celebrated experiments traditionally interpreted through the lens of the Kondo effect. We demonstrate that confined electronic states significantly modify the underlying electron*boson interactions, thereby altering the amplitude and characteristics of the spinaronic states

Keywords: Magnetism; Spin-excitations; Spinarons; TD-DFT; Theory of STM