Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 99: Spins on surfaces at the atomic scale III

O 99.9: Vortrag

Freitag, 13. März 2026, 11:30–11:45, WILL/A317

Tuning the magnetic excitation of a single atom by local gating — •Anna M. H. Krieg, Hermann Osterhage, Julian H. Strik, Niels P. E. van Mullekom, Ben Verlhac, and Alexander A. Khajetoorians — Institute for Molecules and Materials, Radboud University, Nijmegen, the Netherlands

The description of single-atom magnetism depends on the interplay of various degrees of freedom and the balance of different interactions. This includes the interplay between the orbital, spin and charge degrees of freedom, as well as the balance between spin-orbit coupling, hybridization, and different exchange interactions, such as Hund's and Kondo exchange. To date, the strategy to change the magnetic behavior of a single atom is to explore different atom/surface combinations. However, in this way, nearly all these parameters are fixed by the material system and when changing the material system, the entire set of parameters changes. Here, we tune the local electrostatic potential in order to modify the magnetic excitations and tunneling transport of individual Fe atoms. We start with Fe atoms on the surface of InSb(110), and characterize its magnetic excitations as a function of magnetic field. We then harness a newly developed quantum simulator platform, based on patterning Cs atoms on the surface of InSb. We show that by varying the local density of Cs on InSb, we can tune the magnetic excitation of an individual Fe atom. These results serve as a starting point to develop quantum simulation to study magnetic models in which the spin, charge, and orbital degree of freedom can be tuned.

Keywords: Magnetism; STM; Quantum simulator; Atomic manipulation