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Lattice-Contraction-Induced Moiré Patterns in Direction-Controlled Epitaxial Graphene on Cu(111)

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Abstract

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Contrary to the general understanding, direction controlled epitaxial graphenes with an identical rotational angle (R θ = R0ˆ) is reported. Despite the identical Rθ, various Moire patterns with different periodicity are observed, which cannot be understood by conventional Rθ dependence. A new method is suggested for practical analysis, in which degree of lattice contraction of EG results in the various Moire superstructures.

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