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 (E_b=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.

6 pages, 2 figures

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• The GW compendium: A practical guide to theoretical photoemission spectroscopy
• Electron-magnon scattering in elementary ferromagnets from first principles: lifetime broadening and band anomalies
• Renormalized Singles Green's Function in the T-Matrix Approximation for Accurate Quasiparticle Energy Calculation
• Single-Hemisphere Photoelectron Momentum Microscope With Time-of-Flight Recording
• The three channels of many-body perturbation theory: $GW$, particle-particle, and electron-hole $T$-matrix self-energies
• Tuneable electron-magnon coupling of ferromagnetic surface states in PdCoO${}_2$
• Colossal band renormalization and stoner ferromagnetism induced by electron-antiferromagnetic-magnon coupling
• Strong Momentum-Dependent Electron-Magnon Renormalization of a Surface Resonance on Iron
• Disentangling Electron-Boson Interactions on the Surface of a Familiar Ferromagnet