Photoemission "experiments" on holographic lattices

We construct a 2D holographic ionic lattice with hyperscaling-violating infrared geometry and study single-electron spectral functions (“ARPES photoemission curves”) on this background. The spectra typically show three-peak structure, where the central peak undergoes crossover from sharp but not Fermi-liquid-like quasiparticle to wide incoherent maximum, broad side peaks resemble Hubbard bands. These findings are partially explained by perturbative near-horizon analysis of bulk Dirac equation. Comparing Green in imaginary frequency model obtained quantum Monte Carlo, we find that provides very good fit function. However, information loss when transposing frequencies implies deeper connection Hubbard-like models remains questionable.