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Topological quantum numbers in the Hall effect

J. E. Avron, D. Osadchy, R. Seiler

math-pharXiv:math-ph/0303055

Abstract

Topological quantum numbers account for the precise quantization that occurs in the integer Hall effect. In this theory, Kubo's formula for the conductance acquires a topological interpretation in terms of Chern numbers and their non-commutative analog, the Fredholm Indices.

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