This title appears in the Scientific Report : 2019 

Kink far below the Fermi level reveals new electron-magnon scattering channel in Fe
Młyńczak, E. (Corresponding author)
Müller, M. C. T. D. / Gospodarič, P. / Heider, T. / Aguilera, I. / Bihlmayer, G. / Gehlmann, M. / Jugovac, M. / Zamborlini, G. / Tusche, C. / Suga, S. / Feyer, V. / Plucinski, L. / Friedrich, Christoph / Blügel, S. / Schneider, C. M.
Quanten-Theorie der Materialien; IAS-1
Photovoltaik; IEK-5
Elektronische Eigenschaften; PGI-6
Quanten-Theorie der Materialien; PGI-1
Nature Communications, 10 (2019) 1, S. 505
[London] Nature Publishing Group UK 2019
Journal Article
Controlling Configuration-Based Phenomena
Controlling Spin-Based Phenomena
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Many properties of real materials can be modeled using ab initio methods within a single-particle picture. However, for an accurate theoretical treatment of excited states, it is necessary to describe electron-electron correlations including interactions with bosons: phonons, plasmons, or magnons. In this work, by comparing spin- and momentum-resolved photoemission spectroscopy measurements to many-body calculations carried out with a newly developed first-principles method, we show that a kink in the electronic band dispersion of a ferromagnetic material can occur at much deeper binding energies than expected (Eb = 1.5 eV). We demonstrate that the observed spectral signature reflects the formation of a many-body state that includes a photohole bound to a coherent superposition of renormalized spin-flip excitations. The existence of such a many-body state sheds new light on the physics of the electron-magnon interaction which is essential in fields such as spintronics and Fe-based superconductivity.