  We propose the electrical control of a device probing the Josephson effect in
exciton-polariton (EP) condensates, which can be switched between various
dynamical modes. We model the device by a four-component Gross-Pitaevskii
equation assuming that ideal EP condensates are established with well-balanced
pumping and dissipation. All the model parameters are calculated
microscopically. In particular, we obtain the polariton tunneling strength
across the junction as a second-order process of electron-hole pair tunneling.
We find that the EP condensates can be manipulated through distinctive degrees
of freedom not present in other coherent quantum systems, and the dynamics of
EP Josephson junctions are far richer than that of the conventional
superconducting junctions.
