QED With Unequal Charges: A study of spontaneous Zn symmetry breaking
  We study two-dimensional QED with unequal charges at finite temperature, and show that there is a phase with a spontaneously broken $Z_n$ symmetry. In spite of this, we were not able to establish the presence of domain walls. The relevance for QCD in higher dimensions is discussed. 
T.H. Hansson, H.B. Nielsen and I. Zahed