Fig. 2

Spin-resolved band dispersion maps. a Dispersion of cobalt bands along the K-Γ-K and W-X-W directions as function of binding energy (E-E_F), measured at hv = 50 eV. The left half in a shows the spin-averaging experiment on a grey intensity scale, and the right half the spin-resolved experiment in the same 2D colour code as in Fig. 1. Dashed horizontal lines indicate energies of 2D momentum maps in Fig. 4. b Calculated spin-resolved photoemission intensities corresponding to a using momentum-dependent corrections for the band renormalization \(\frak{Re}\)Σ_σ(k) as in e, and constant (left half) or E-dependent broadening ℑ\(\frak{m}\)Σ_σ(E) (right half). Dashed curves indicate faint band positions as guide to the eye. c Calculation using a constant \(\frak{Re}\)Σ for as in f. The bottom of the majority electron parabola (see solid arrows) lies too deep, compared with the experiment in a and calculation in b. The right half of panel c uses an energy depended ℑ\(\frak{m}\)Σ_σ(E) following DMFT calculations from Ref. ¹¹, which underestimates broadening close to E_F. d Photoemission geometry used both, in experiment and theory: The photon beam is incident along the positive k_y direction with 25° towards the surface, magnetization M and polarization P are in-plane along k_y