Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Computational Magnetism 2
MA 15.7: Vortrag
Dienstag, 6. September 2022, 11:00–11:15, H48
First principles theory of electron-magnon scattering and the spin polarized electron energy loss spectroscopy — •Sebastian Paischer1, Pawel Buczek2, Mikhail Katsnelson3, and Arthur Ernst1 — 1JKU Linz — 2HAW Hamburg — 3Radboud University Nijmegen
Magnetic solids constitute a very important class of materials as they are extensively used in everyday life and are essential to many new technologies currently under development. In spite of their high relevance, some of the basic properties, like the interaction between electronic and magnetic degrees of freedom still remain a mystery. It leads to spin dependent lifetimes of electronic states and inelastic electron transport to name but a few. In our current study we investigate the impact of magnetic excitations on the electronic spectrum of solids as well as the scattering of high energy electrons with magnetic materials to formulate an ab initio theory for the spin polarized electron energy loss spectroscopy (SPEELS). Our approach is formulated in the framework of the formally exact many body GW theory. The novelty in our approach is that quantities from linear response time dependent density functional theory (LRTDDFT) calculations will be used to approximate an effective interaction between electrons and magnons. As our LRTDDFT calculations are based upon the Korringa-Kohn-Rostocker method, bulk systems as well as complex geometries can be accounted for. In this presentation, we sketch the theoretical basis of the electron-magnon scattering as well as the SPEELS theory and show several results.