  In high-energy nuclear collisions, heavy quark potential at finite
temperature controls the quarkonium production. Including the relaxation of the
medium induced by the relative velocity between quarkonia and the deconfined
expanding matter, the Debye screening is reduced and the quarkonium
dissociation takes place at a higher temperature. As a consequence of the
velocity dependent dissociation temperature, the quarkonium suppression at high
transverse momentum is significantly weakened in high energy nuclear collisions
at RHIC and LHC.
