Ground state for the Penrose Laplacian, describing a 2D quasicrystal, obtained with an algorithm that allows the computation of spectra of local operators in infinite systems with rigorous well-defined error bounds.

From the article:

How to Compute Spectra with Error Control
Matthew J. Colbrook, Bogdan Roman, and Anders C. Hansen
Phys. Rev. Lett. 122, 250201 (2019)

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