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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, Ilias Klepetsanis², Juba Bouaziz², and Samir Lounis¹ — ¹Institute of Physics, Martin-Luther-University Halle-Wittenberg, Germany — ²Peter Grünberg Institut, Forschungszentrum Jülich and JARA, Germany

Cobalt atoms on noble-metal (111) surfaces served as a paradigm for the Kondo effect in scanning tunnelling spectroscopy (STS) experiments. However, our first-principles predictions [1], supported by high-magnetic-field STS measurements [2,3], challenge this view. We showed that the observed anomalies originate from a new many-body state, the spinaron, arising from the interaction between an excited magnetic moment and a trapped surface electron. Using time-dependent DFT combined with many-body perturbation theory, we investigate quantum-confinement by engineering corrals hosting a Co adatom, revisiting experiments interpreted via the Kondo effect [4]. We prove that confined electronic states significantly modify the underlying electron-boson interactions, thus altering the characteristics of the spinaronic states. – Funding provided by DFG, LO 1659/11-1.

[1] Bouaziz et al., Nat. Comm. 11, 6112 (2020); [2] Friedrich et al., Nat. Phys. 20, 28 (2024); [3] N. Noei et al., Nanoletters 23, 8988 (2023); [4] Manoharan et al., Nature 403, 512 (2000).

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