Abstract
We make a theoretical study of the stability of nonequilibrium polariton superflows that interact with a cylindrical defect. The nonresonantly pumped polariton condensate is modeled with a generalized complex Ginzburg-Landau equation. At low pump intensities the dissipation is found to stabilize the superflow. At large pump intensities, we find an instability that sets a lower critical speed for superfluidity. For even larger pump power, the lower and upper critical speeds meet and stable superflows are no longer possible.
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