  The phase diagram of the Schwinger model on the lattice with Wilson fermions
is investigated in the Hartree-Fock approximation. In case of single flavour
(not directly amenable to simulations), the calculation indicates the existence
of the parity violating phase at both weak and intermediate-to-strong
couplings. Hartree-Fock vacuum sustains a nonzero electric field in this broken
phase. The phase structure of the model with two flavours is also discussed.
