Fig. 2

Kink far below the Fermi level observed by the photoemission experiment and reproduced by the GT theory. a Photoemission measurement performed using hν = 70 eV and s-polarized light. Superimposed is the result of the single-particle LSDA calculation, where blue and red lines indicate minority and majority bands, respectively. Arrows show the region of the dispersion anomaly. b Result of the renormalization with the GT self-energy for both spin directions (k_x < 0) together with the undressed LSDA bands and only for the minority spin (k_x > 0). Experimental (c) and theoretical (d) results with superimposed peak positions extracted from the Lorentzian fits (red symbols). e Exemplary MDC for E_b = 1.0 eV (circles) with a Lorentzian fit (solid line). f Total and minority theoretical (black solid and red dashed lines) and total experimental spectral function (red symbols) obtained for k_x = 1.3 Å⁻¹, marked by dashed vertical lines in c and d