# Regensburg 2019 – wissenschaftliches Programm

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# O: Fachverband Oberflächenphysik

## O 11: Frontiers of Electronic-Structure Theory: Focus on the Interface Challenge II (joint session O/CPP/DS/TT)

### O 11.3: Vortrag

### Montag, 1. April 2019, 15:30–15:45, H9

**Electron-magnon scattering in elementary ferromagnets from first principles: implementation and results** — •Christoph Friedrich, Mathias C.T.D. Müller, and Stefan Blügel — Peter Grünberg Institut and Institute of Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany

Propagating electrons and holes can scatter with spin fluctuations
and form quasiparticles as a result or more complex many-body states.
To calculate this effect, a ** k**-dependent self-energy
describing
the scattering of electrons and magnons is constructed from the solution of
a Bethe-Salpeter equation for the

*T*matrix. Partial self-consistency is achieved by the alignment of the chemical potentials. We discuss details of the implementation and illustrative results. The renormalized electronic band structures exhibit strong spin-dependent lifetime effects close to the Fermi energy, which are strongest in Fe. The renormalization gives rise to a band anomaly at large binding energies in iron, which results from a coupling of the quasihole with Stoner excitations.