Phase structure of QED3 at finite temperature

Abstract Dynamical symmetry breaking in three-dimensional QED with N fermion flavours is considered at finite temperature, in the large N approximation. Using an approximate treatment of the Schwinger-Dyson equation for the fermion self-energy, we find that chiral symmetry is restored above a certain critical temperature which depends itself on N . We find that the ratio of the zero-momentum-zero-temperature fermion mass to the critical temperature has a large value compared with four-fermion theories, as has been suggested in a previous work with a momentum-independent self-energy. Evidence of a temperature-dependent critical N is shown to appear in this approximation. The phase diagram for spontaneous mass generation in the theory is presented in T - N space.