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We have studied the phenomenology of pion condensation in 2-flavor neutralquark matter at finite density with Nambu--Jona-Lasinio (NJL) model of QCD. Wehave discussed the role of the bare quark mass $m$ and the electric chemicalpotential $\mu_{e}$ in controlling the condensation. The central result of thiswork is that the onset for $\pi$-condensed phase occurs when $|\mu_{e}|$reaches the value of the in-medium pion mass $M_{\pi}$ provided the transitionis of the second order, even for a composite pion system in the medium.Finally, we have shown that the condensation is extremely fragile with respectto the explicit chiral symmetry breaking via a finite current quark mass.

A microscopic study of pion condensation within Nambu--Jona-Lasinio model