Abstract
We assume the existence of sufficiently localised states, near the edges of each Landau band. We then prove that the Hall conductivity is quantised and the parallel conductivity vanishes, when the filling factor stays close to an integer. The Hall integer is a topological invariant, given by the Landau band index.
We also prove that at weak disorder, the localisation length diverges in each Landau band.
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Communicated by E. Lieb
Dedicated to Walter Thirring on his 60th birthday
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Kunz, H. The quantum hall effect for electrons in a random potential. Commun.Math. Phys. 112, 121–145 (1987). https://doi.org/10.1007/BF01217683
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DOI: https://doi.org/10.1007/BF01217683