Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 47: Focus Session: Atomic-Scale Studies of Spins on Surfaces with Scanning Tunneling Microscopy 1
O 47.3: Vortrag
Mittwoch, 7. September 2022, 15:45–16:00, S051
Experimental Determination of a Single Atom Ground State Orbital through Hyperfine Anisotropy — •Laëtitia Farinacci1, Lukas M. Veldman1, Philip Willke2, and Sander Otte1 — 1Delft University of Technology, Delft, The Netherlands — 2Karlsruhe Institute of Technology, Karlsruhe, Germany
Electron spin resonance has long been a powerful tool for electronic analysis. Its recent combination with scanning tunneling microscopy [1] gives exceptional energy resolution for the investigation of the magnetism of single atoms in addition to a very good characterization of their spatial surroundings.
Here, we provide a full angle-dependent investigation of the anisotropy of the hyperfine splitting of single Ti atoms on MgO/Ag(100). We find that the anisotropy of the hyperfine splitting is related to that of the g factor: spin-orbit coupling leads to a partially unquenched angular momentum which couples to the electron spin and thereby affects its interaction both with an external magnetic field and the nuclear spin of the nucleus. Combining the symmetry properties of the atoms binding site with a simple point charge model, we provide a method to predict the shape of the ground state orbital of the Ti atom. Relying on experimental values only, this analysis paves the way for a new protocol for electronic structure analysis for spin centers on surfaces.
[1] Baumann et al., Science 350 (2015)