  In this work the above-band gap absorption spectrum in two-dimensional Dirac
materials is calculated with account for the interaction between the
photocarriers. Both the screened Rytova-Keldysh and pure Coulomb attraction
potentials between the electron and hole are used in the study. We find that,
in the materials under consideration, the interaction enhances the absorbance
in the narrow interband edge region, in a sharp contrast to the band model with
the parabolic free-carrier energy dispersion. We develop an approximation of
the weak interaction which allows us to reproduce the main features of the
exactly calculated Sommerfeld factor. We show a substantial reduction of this
factor at higher frequencies due to the single-particle energy renormalization.
