Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 49: Focus Session: Spins on Surfaces II (joint session O/MA)

MA 49.4: Vortrag

Donnerstag, 4. April 2019, 16:00–16:15, H15

Magnetic excitation spectra of single atoms on magnetic and non-magnetic substrates — •Juba Bouaziz, Manuel dos Santos Dias, and Samir Lounis — Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

At low temperatures, inelastic scanning tunneling spectroscopy is a tool of predilection for the inspection of magnetic excitation spectra of single atoms deposited on surfaces. We employ a first-principles approach for the computation of the inelastic tunneling spectra relying on the Korringa-Kohn-Rostoker Green function method in combination with time-dependent density functional theory and many-body perturbation theory [1]. We extend the method to account for non-collinear magnetism and spin-orbit driven phenomena. The central quantity of our work is the electron’s self-energy which encodes the coupling of the electron to the spin-excitation and renormalizes the electronic structure. We investigate 3d transition metal adatoms deposited on non-magnetic substrates such as Re(0001) and on magnetic surfaces such as PdFeIr(111) capable of hosting magnetic skyrmions [2,3].
  [1] B. Schweflinghaus et al. Physical Review B 89, 235439 (2014).
  [2] N. Romming et al. Science 341, 636-639 (2013).
  [3] D. M. Crum et al. Nature Communications 6, 8541 (2015).
This work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (ERC consolidator Grant No. 681405 DYNASORE).