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An insulated state in a non-interacting system arising from the destructive interference among multiple-scattering paths in a condensed matter system.

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How to derive Eq.(1) in Prof. A Leggett's lecture note?

I came across a lecture note on weak localisation by Prof. A. J. Leggett. In this note, he wrote down his first equation as follows: $$\sigma = \lim_{\omega\rightarrow 0} \lim_{q\rightarrow 0} \frac{1 …
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