Dirac electrons in a dodecagonal graphene quasicrystal

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Science  24 Aug 2018:
Vol. 361, Issue 6404, pp. 782-786
DOI: 10.1126/science.aar8412

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Dirac fermions in quasicrystalline graphene

Quasicrystal lattices, which can have rotational order but lack translational symmetry, can be used to explore electronic properties of materials between crystals and disordered solids. Ahn et al. grew graphene bilayers rotated exactly 30° that have 12-fold rotational order. Electron diffraction and microscopy confirmed the formation of quasicrystals, and angle-resolved photoemission spectroscopy revealed anomalous interlayer electronic coupling that was quasi-periodic. The millimeter-scale layers can potentially be transferred to other substrates.

Science, this issue p. 782