Probing deconfinement in the Polyakov-loop extended Nambu-Jona-Lasinio   model at imaginary chemical potential
  The phase structure of Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model is explored at imaginary chemical potential, with particular emphasis on the deconfinement transition. We point out that the statistical confinement nature of the model naturally leads to characteristic dependence of the chiral condensate $<\bar{q}q>$ on $\theta=\mu_I/T$. We introduce a dual parameter for the deconfinement transition by making use of this dependence. By changing a four-fermion coupling constant, we tune the location of the critical endpoint of the deconfinement transition. 
Kenji Morita, Vladimir Skokov, Bengt Friman, Krzysztof Redlich
hep-ph hep-lat nucl-th