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| Home > Publications database > Electron–plasmon and electron–magnon scattering in elementary ferromagnets from first principles: the $GWT$ self-energy |
| Home > Publications database > Electron–plasmon and electron–magnon scattering in elementary ferromagnets from first principles: the $GWT$ self-energy |
| Conference Presentation (Invited) | FZJ-2024-00041 |
2023
Abstract: This work combines two powerful self-energy techniques: the well-known $GW$ method and a self-energy recently developed by us that describes renormalization effects caused by the scattering of electrons with magnons and Stoner excitations. This $GT$ self-energy, which is fully k-dependent and contains infinitely many spin-flip ladder diagrams, was shown to have a profound impact on the electronic band structure of Fe, Co, and Ni. In the present work, we refine the method by combining $GT$ with the $GW$ self-energy. The resulting $GWT$ spectral functions exhibit strong lifetime effects and emergent dispersion anomalies. They are in an overall better agreement with experimental spectra than those obtained with $GW$ or $GT$ alone, even showing partial improvements over local-spin-density approximation dynamical mean-field theory. The performed analysis provides a basis for applying the $GWT$ technique to a wider class of magnetic materials. This work was supported by the European Centre of Excellence MaX “Materials design at the Exascale” (grant no. 824143) funded by the EU. We gratefully acknowledge the computing time granted through JARA-HPC on the supercomputer JURECA at Forschungszentrum Jülich.
Keyword(s): Basic research (1st) ; Condensed Matter Physics (2nd)
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