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arXiv · 2211.01431

Disentangling Electron-Boson Interactions on the Surface of a Familiar Ferromagnet

Håkon I. Røst·Federico Mazzola·Johannes Bakkelund·Anna Cecilie Åsland·Jinbang Hu·Simon P. Cooil·Craig M. Polley·Justin W. Wells
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Abstract

We report energy renormalizations from electron-phonon and electron-magnon interactions in spin minority surface resonances on Ni(111). The different interactions are identified, disentangled, and quantified from the characteristic signatures they provide to the complex self-energy and the largely different binding energies at which they occur. The observed electron-magnon interactions exhibit a strong dependence on momentum and energy band position in the bulk Brillouin zone. In contrast, electron-phonon interactions from the same bands appear to be relatively momentum- and symmetry-independent. Additionally, a moderately strong ($\lambda>0.5$) electron-phonon interaction is distinguished from a near-parabolic spin majority band not crossing the Fermi level.

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Håkon I. Røst, Federico Mazzola, Johannes Bakkelund, Anna Cecilie Åsland, Jinbang Hu, Simon P. Cooil, Craig M. Polley, Justin W. Wells. 2022-11-02. Disentangling Electron-Boson Interactions on the Surface of a Familiar Ferromagnet. https://doi.org/10.1103/physrevb.109.035137

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