On the critical behavior of (2+1)-dimensional QED
  It is shown the analysis [1] for QED in 2+1 dimensions with N four-component fermions in the leading and next-to-leading orders of the 1/N expansion. As it was demonstrated in [1] the range of the admissible values N, where the dynamical fermion mass exist, decreases strongly with the increasing of the gauge charge. So, in Landau gauge the dynamical chiral symmetry breaking appears for N<3.78, that is very close to the results of the leading order and in Feynman gauge dynamical mass is completely absent. 
A.V. Kotikov
hep-ph hep-th