QUANTUM HALL FERROMAGNETS

It was pointed out recently that the nu = 1/m quantum Hall states in b ilayer systems behave like easy plane quantum ferromagnets. We study t he magnetotransport of these systems using their ''ferromagnetic'' pro perties and a novel spin-charge relation of their excitations. The gen eral transport is a combination of the usual Hall transport and a time dependent transport with quantized time average. The latter is due to a phase slippage process in spacetime and is characterized by two top ological constants.