Abstract. We investigate the interplay of the Polyakov loop and the quark–antiquark condensates in scalar and pseudoscalar channels in the extended-Polyakov–NJL (PNJL) model at finite temperature and isospin chemical potential without baryon chemical potential. We discuss the effect of the dynamical parameter and thermodynamical parameter μ_I on the chiral property especially. The meson's collective excitation modes are calculated and compared with the NJL model's results. The T–μ_I phase diagram is obtained. It contains four regions, including the meson gas, two-flavor quark gas, the BEC superfluidity and BCS superfluidity.

Print publication: Issue 12 (December 2009)
Received 7 July 2009
Published 23 October 2009