Kink far below the Fermi level reveals new electron-magnon scattering channel in Fe.

ABSTRACT: 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 renormal

SUBMITTER: Mlynczak E 

PROVIDER: S-EPMC6355843 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature