SKM 2023 – scientific programme
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MA: Fachverband Magnetismus
MA 27: Electron Theory of Magnetism and Correlations
MA 27.6: Talk
Wednesday, March 29, 2023, 11:00–11:15, HSZ 403
Nonlocal correlation effects due to virtual spin-flip processes in itinerant electron ferromagnets — •Sebastian Paischer1, Mikhail Katsnelson2, Giovanni Vignale3, Arthur Ernst1, and Pawel Buczek4 — 1Johannes Kepler University, Linz, Austria — 2Radboud University, Nijmegen, Netherlands — 3National University of Singapore, Singapore — 4Hamburg University of Applied Sciences, Hamburg, Germany
An important type of the many-body effects in itinerant-electron magnets originates from the interaction of electrons with bosonic spin-flip excitations, both coherent (magnons) and incoherent (Stoner particle-hole excitations). While there has been a steady progress in understanding the properties of spin-flip excitations at a model level only little is known about microscopic details of their interactions with the electronic degrees of freedom in specific materials. Over the last few years we developed a first-principles method to account for the electron-magnon interaction in complex solids. While the method is based upon many body perturbation theory, we approximate the complex quantities from perturbation theory with quantities from time dependent density functional theory. This drastically reduces the numerical burden of the calculations and allows to consider complex materials like half-metallic ferromagnets. In this talk some of the main results and insights from this method will be presented.