Effects of dynamical quark flavors on imaginary potential and thermal width in heavy quarkonium from AdS/CFT correspondence

In this work, we investigate the unquenched effects on the imaginary potential and thermal width within the framework of the AdS/CFT correspondence. Using the Nambu-Goto action, we find that the imaginary potential vanishes in the quenched system ( N f = 0 ) due to confinement, while it becomes non-zero in the unquenched two-flavor ( N f = 2 ) system, with its absolute value increasing monotonically as a function of the temperature-length parameter ( LT ). The introduction of the flavors is found to significantly enhance the thermal width. Additionally, in the low-temperature regime, the inclusion of light quark flavors reduces the stopping distance. Furthermore, the onset of the imaginary potential occurs at earlier thresholds as the chemical potential increases.