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We study QED corrections to chiral symmetry breaking in theNambu--Jona-Lasinio (NJL) model with two flavors of quarks. In this model, theisospin symmetry is broken by the differences between the current quark massesand the electromagnetic charges of the up and down quarks. To leading order inthe 1/N expansion, we calculate the effective potential of the model withone-loop QED corrections at finite temperature.  Evaluating the effective potential, we study the influence of the isospinsymmetry breaking on the orientation of chiral symmetry breaking.  The current quark mass plays an essential role in maintaining the orientationof the chiral symmetry breaking.  If the average of the up and down quark masses is small enough, we find aphase in which the pion field has non-vanishing expectation value and dynamicalCP violation takes place.Comment: 22 pages, 13 figures; added discussion about pion mass differenc

Influence of QED Corrections on the Orientation of Chiral Symmetry Breaking in the NJL Model