99-343 H. Schulz-Baldes, J. Kellendonk, Th. Richter
Simultaneous quantization of edge and bulk Hall conductivity (186K, postscript) Sep 19, 99
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Abstract. The edge Hall conductivity is shown to be an integer multiple of $e^2/h$ which is almost surely independent of the choice of the disordered configuration. Its equality to the bulk Hall conductivity given by the Kubo-Chern formula follows from K-theoretic arguments. This leads to quantization of the Hall conductance for any redistribution of the current in the sample. It is argued that in experiments at most a few percent of the total current can be carried by edge states.

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