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I want to learn how to solve Harper's equation and plot the Hofstader butterfly spectrum numerically. Can anyone suggest references/links where this is done?

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  • $\begingroup$ Computational Science SE might be a better place to ask this question. $\endgroup$ Nov 19 '20 at 1:50
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Have a look at a recent paper [1]. This may be what you are looking for. Since it is recent, you can look at its references to look backwards for more traditional methods that are perhaps less accurate.

[1] Colbrook, Matthew J., Bogdan Roman, and Anders C. Hansen. "How to compute spectra with error control." Physical review letters 122.25 (2019): 250201.

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  • $\begingroup$ Thanks for the link $\endgroup$
    – user101331
    Nov 22 '20 at 10:22

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