  We study the influence of light quark loops on the Wigner phase by solving
coupled Dyson-Schwinger equations for quark propagator and gluon propagator. We
take the gluon propagator in the Nambu phase from $N_f$ = 2 unquenched lattice
QCD and choose various phenomenological models for the quark-gluon vertex. The
gluon propagator in Winger phase is assumed to be different from that in the
Nambu phase only due to the vacuum polarization of the quark loop. We obtain
the Wigner solution of the coupled equations, compared with that from solving
only the equation of the quark propagator. We discussed the corrections by the
light quark loops and the dependence on various models of the quark-gluon
vertex.
