Phys. Rev. Lett. 73, 874–877 (1994)Quantum Hall ferromagnetsReceived 4 February 1994; published in the issue dated 8 August 1994 It was pointed out recently that the ν=1/m quantum Hall states in bilayer systems behave like easy plane quantum ferromagnets. We study the magnetotransport of these systems using their ‘‘ferromagnetic’’ properties and a novel spin-charge relation of their excitations. The general 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 topological constants. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.73.874
DOI:
10.1103/PhysRevLett.73.874
PACS:
73.40.Hm, 64.60.Cn, 73.20.Dx, 75.10.-b
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