Figure 2: Spectral function from photoemission and many-body theory.
From: Magnetic order in a frustrated two-dimensional atom lattice at a semiconductor surface
Comparison of the ARPES data (T≈60 K, hv=130 eV) in (a,c) with the spectral functions from LDA+DCA calculations in (b,d), along 
and 
directions, respectively. White arrows indicate band maxima, which are not present in the metallic LDA-derived bands (see LDA plots, left-hand side), but are created by the Mott-insulating state, characterized by shadow bands. Yellow circles around 
highlight these shadow bands observed in both ARPES and in the LDA+DCA calculations.
