Fig. 2: Spectral function of RbFe2As2.
From: Dispersion kinks from electronic correlations in an unconventional iron-based superconductor
a ARPES spectrum across the Brillouin zone center taken at 20 K with a photon energy of 60 eV. We use linear vertically (LV) polarized light, which highlights the dxz orbital. The spectrum was divided by a Fermi-Dirac function. Inset shows the momentum cut (green line) through the Brillioun zone (white square). b Spectral function along kx calculated by DMFT and projected onto the dxz orbital. c Selected momentum-distribution curves (MDCs) extracted from a (red), which were fitted to a function that adds two Lorentzian peaks and a linear background (black). d same as (c) for the spectral function shown in (b) with fits by single Lorentzian peaks. e, g Dispersion and FWHM extracted from fits to the ARPES MDCs. f, h Dispersion and FWHM extracted from MDC fits to the DMFT spectral function. The arrows in (e, f, g, and h) mark the position of two dispersion kinks.
