Berlin 2024 – scientific programme
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O: Fachverband Oberflächenphysik
O 110: Surface Magnetism
O 110.5: Talk
Friday, March 22, 2024, 11:30–11:45, MA 144
Multi-orbital interactions and spin polarization in single lanthanide adatoms — •Massine Kelai1, Stefano Reale1, Jaehyun Lee1, Philippe Ohresser2, Deung-Jang Choi3, Fabrice Scheurer4, Aparajita Singha5, and Fabio Donati1 — 1Center for Quantum Nanoscience, Institute for Basic Science, Seoul, Republic of Korea — 2Synchrotron SOLEIL, L’Orme des Merisiers, France — 3Donostia International Physics Center, Donostia-San Sebastián, Spain — 4Institut de Physique et Chimie des Matériaux de Strasbourg, Strasbourg, France — 5Max Planck Institute for Solid State Research, Stuttgart, Germany
Lanthanide atoms on surfaces show enormous potential for quantum information technologies. The use of a specific atom as an atomic-scale memory unit or qubit depends on the magnetic quantum level structure, which arises from the interaction between the atom and the substrate. Understanding the magnetic and electronic properties requires insight into the 4f and 5d6s orbitals, as well as their mutual interaction. Here, we investigate Nd atoms on Ag(100), HOPG, and Pb(111) using X-ray absorption and magnetic circular dichroism spectroscopies. The results show electronic transitions from atomic-like to bulk-like configurations with increased coordination on Ag(100) and HOPG, while Pb(111) remains bulk-like even for single atoms, and demonstrate that the Coulomb repulsion drives the electronic transition. We also reveal the existence of a fraction of spin-polarized 5d electrons for single atoms. This research enhances the understanding of the magnetism of surface-supported lanthanides.
Keywords: Lanthanides; X-ray magnetic circular dichroism; Orbital resolution; Coulomb interaction; Spin polarization