Infrared behaviour of the fermion propagator in unquenched QED$_3$ with   finite threshold effects
  To remove the linear infrared divergences in quenched approximation we include the massive fermion loop to the photon spectral function.Spectral function of fermion has no one particle singularity if we fix the anomalous dimension to be unity.In the case of $N$ flavour,$N$ dependence of order parameter is mild which may be due to screening effects. 
Yuichi Hoshino