Charge Neutrality Effects on 2-flavor Color Superconductivity

The effect of electric and color neutrality on 2-flavor color superconductivity has been investigated. It has been found that the effect of the charge neutrality on a 2-flavor quark system is very different from that on a 3-flavor system. The BCS diquark pair in 2-flavor color superconducting phase has been largely reduced by the large Fermi momentum of electron, the diquark condensate first increases with the increasing of quark's chemical potential $\mu$,then decreases rapidly and finally disappears at about $\mu=535MeV$, at which the thermodynamic potential equals to that in the neutral normal 2-flavor quark matter.