Enhancement of Resonant Activation by Constant Bias Current for Superconducting Junction

We consider a superconducting (Josephson) junction driven by the thermal noise with an ac drive current and a dc constant bias current in the overdamped case and in the underdamped case, respectively, and investigate the effect of the constant bias current on the evolution of the net voltage versus the driving frequency. It is shown that, with some suitably selected values of the system's parameters, suitably increasing the absolute value of the constant bias current can lead to the enhancement of resonant activation of the net voltage versus the driving frequency. This result can benefit the investigation for the Josephson junction subjected to the constant bias current (or voltage).