TY  - JOUR
AU  - Młyńczak, E.
AU  - Müller, M. C. T. D.
AU  - Gospodarič, P.
AU  - Heider, T.
AU  - Aguilera, I.
AU  - Bihlmayer, G.
AU  - Gehlmann, M.
AU  - Jugovac, M.
AU  - Zamborlini, G.
AU  - Tusche, C.
AU  - Suga, S.
AU  - Feyer, V.
AU  - Plucinski, L.
AU  - Friedrich, Christoph
AU  - Blügel, S.
AU  - Schneider, C. M.
TI  - Kink far below the Fermi level reveals new electron-magnon scattering channel in Fe
JO  - Nature Communications
VL  - 10
IS  - 1
SN  - 2041-1723
CY  - [London]
PB  - Nature Publishing Group UK
M1  - FZJ-2019-01194
SP  - 505
PY  - 2019
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:30705281
UR  - <Go to ISI:>//WOS:000457290300001
DO  - DOI:10.1038/s41467-019-08445-1
UR  - https://juser.fz-juelich.de/record/860440
ER  -