Remarks on the Current - Carrying State of Hall Superfluids ⋆

I discuss in an elementary and self-contained way the nature of the currentcarrying state in Hall superfluids. The explicit connection of fractional charge and rationality of the filling fraction ν with quantization of angular momentum, and the discussion of the preferred velocity profile for bulk current flows may be new; the latter might provide an interesting experimental handle on a fundamental aspect of quantum superfluidity.