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Chiral Magnetic Wave (CMW) is a gapless collective excitation of quark-gluonplasma in the presence of external magnetic field that stems from the interplayof Chiral Magnetic (CME) and Chiral Separation Effects (CSE); it is composed bythe waves of the electric and chiral charge densities coupled by the axialanomaly. We consider CMW at finite baryon density and find that it induces theelectric quadrupole moment of the quark-gluon plasma produced in heavy ioncollisions: the "poles" of the produced fireball (pointing outside of thereaction plane) acquire additional positive electric charge, and the "equator"acquires additional negative charge. We point out that this electric quadrupoledeformation lifts the degeneracy between the elliptic flows of positive andnegative pions leading to $v_2(\pi^+) < v_2(\pi^-)$, and estimate the magnitudeof the effect.

Chiral magnetic wave at finite baryon density and the electric quadrupole moment of quark-gluon plasma in heavy ion collisions