In paper PRL 101, 246807 (2008), authors use "Peierls substitution", that is ky -> -i(adsbygoogle = window.adsbygoogle || []).push({}); ∂y. As we know, ky is eigenvalue of translation operator in period potential, while -i∂y is momentum operator, it seems they are huge different. So I wonder how to get ""Peierls substitution" in strict math way?

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# A How to get Peierls substitution in edge state?

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