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@INPROCEEDINGS{Blgel:1014994,
      author       = {Blügel, Stefan},
      title        = {{E}lectron-{M}agnon {S}cattering in {E}lementary
                      {F}erromagnets},
      reportid     = {FZJ-2023-03530},
      year         = {2023},
      abstract     = {I report on the combination of 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 [1], which is
                      fully k-dependent and contains infinitely many spin-flip
                      ladder diagrams T [2], was shown to have a profound impact
                      on the electronic band structure of Fe, Co, and Ni [3, 4].
                      In the presentation, I present the refinement of the method
                      by combining GT with the GW self-energy. The resulting GWT
                      spectral functions [5] 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
                      [3]. According to our analysis, this method provides a basis
                      for applying the GWT technique to a wider class of magnetic
                      materials. By comparing spin- and momentum-resolved
                      photoemission spectroscopy measurements to these many-body
                      calculations we found a surprising kink in the electronic
                      band dispersion of a ferromagnetic material at much deeper
                      binding energies than ever expected (Eb = 1.5 eV).},
      month         = {Sep},
      date          = {2023-09-11},
      organization  = {The 10th international Workshop on
                       Strong Correlations and Angle-Resolved
                       Photoemission Spectroscopy, Beijing
                       (Peoples R China), 11 Sep 2023 - 15 Sep
                       2023},
      subtyp        = {Invited},
      cin          = {PGI-1 / IAS-1 / JARA-HPC / JARA-FIT},
      cid          = {I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)IAS-1-20090406 /
                      $I:(DE-82)080012_20140620$ / $I:(DE-82)080009_20140620$},
      pnm          = {5211 - Topological Matter (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5211},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1014994},
}