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We present results from the first lattice simulations of three dimensionalnon-compact quantum electrodynamics (QED3) with N_f four-component fermionflavors coupled to a weak Z(2) chirally invariant four-fermi interaction.Results with $N_f \ge 4$ show that the scaling near the strong coupling chiraltransition or sharp crossover is determined by the 3d Gross Neveuultraviolet-stable renormalization group fixed point. Small deviations of theN_f=4 critical exponents from the respective Gross Neveu ones, hint at evidencefor non-zero fermion mass generated by the gauge fields dynamics that mighthave been enhanced by the four-fermi coupling. It is also shown that thescaling region is suppressed at weak four-fermi couplings and large N_f values.Measurements of i) a monopole susceptibility which is the polarizability of themonopole configurations, and ii) the density of isolated monopoles, imply thatfor $N_f \ge 1$ and weak gauge couplings the monopoles do not affect thetheory's confining properties, because they are shielded.

Chiral symmetry breaking and monopole dynamics in non-compact QED3 coupled to a four-fermi interaction