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Disordered quantum Hall ferromagnets and cooperative transport anisotropy

Chalker, J. T. ; Polyakov, D. G. ; Evers, Ferdinand ; Mirlin, A. D. ; Wölfle, P.


We discuss the behaviour of a quantum Hall system when two Landau levels with opposite spin and combined filling factor near unity are brought into energetic coincidence using an in-plane component of magnetic field. We focus on the interpretation of recent experiments under these conditions (Phys. Rev. Lett. 86 (2001) 866; Phys. Rev. B 64 (2001) 121305), in which a large resistance anisotropy ...


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