Fredholm Indices and the Phase Diagram of Quantum Hall Systems
Joseph E. Avron, Lorenzo Sadun
Abstract
The quantized Hall conductance in a plateau is related to the index of a Fredholm operator. In this paper we describe the generic ``phase diagram'' of Fredholm indices associated with bounded and Toeplitz operators. We discuss the possible relevance of our results to the phase diagram of disordered integer quantum Hall systems.
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