%0 Journal Article
%A Młyńczak, E.
%A Müller, M. C. T. D.
%A Gospodarič, P.
%A Heider, T.
%A Aguilera, I.
%A Bihlmayer, G.
%A Gehlmann, M.
%A Jugovac, M.
%A Zamborlini, G.
%A Tusche, C.
%A Suga, S.
%A Feyer, V.
%A Plucinski, L.
%A Friedrich, Christoph
%A Blügel, S.
%A Schneider, C. M.
%T Kink far below the Fermi level reveals new electron-magnon scattering channel in Fe
%J Nature Communications
%V 10
%N 1
%@ 2041-1723
%C [London]
%I Nature Publishing Group UK
%M FZJ-2019-01194
%P 505
%D 2019
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:30705281
%U <Go to ISI:>//WOS:000457290300001
%R 10.1038/s41467-019-08445-1
%U https://juser.fz-juelich.de/record/860440