Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.27: Poster

Dienstag, 2. April 2019, 10:00–13:00, Poster E

Self-energy contribution of electron-magnon coupling in the homogeneous electron gas — •Maximilian Kulke and Arno Schindlmayr — Department Physik, Universität Paderborn, 33095 Paderborn, Germany

Electronic band structures of ferromagnetic materials are not only affected by electronic correlation but also by the coupling to magnons. This coupling can be treated as part of the electronic self-energy, where the magnon propagator is either described by many-body perturbation theory or by time-dependent density-functional theory. The latter is computationally simpler, because the self-energy can be evaluated analogous to the GW approximation for electronic correlation, but the quality of the results depends on the accuracy of the exchange-correlation kernel. In practice, the adiabatic local-density approximation (ALDA) is used almost universally until now. To study the influence of the kernel, we focus on the spin-polarized homogeneous electron gas and evaluate the electron-magnon coupling with different wave-vector-dependent exchange-correlation kernels that go beyond the ALDA. As further numerical approximations that are typically required for real materials can be avoided in this case, we are thus able to assess the essential features of the exchange-correlation kernel that are relevant for the electron-magnon coupling.