Raman Fingerprint of Aligned Graphene/h-BN Superlattices
Nano Letters2013Vol. 13(11), pp. 5242–5246
Citations Over TimeTop 10% of 2013 papers
Axel Eckmann, Jaesung Park, Huafeng Yang, D. C. Elias, Alexander S. Mayorov, Geliang Yu, R. Jalil, Kostya S. Novoselov, Roman Gorbachev, Michele Lazzeri, A. K. Geǐm, Cinzia Casiraghi
Abstract
Graphene placed on hexagonal-boron nitride (h-BN) experiences a superlattice (Moiré) potential, which leads to a strong reconstruction of graphene's electronic spectrum with new Dirac points emerging at sub-eV energies. Here we study the effect of such superlattices on graphene's Raman spectrum. In particular, the 2D Raman peak is found to be exquisitely sensitive to the misalignment between graphene and h-BN lattices, probably due to the presence of a strain distribution with the same periodicity of the Moiré potential. This feature can be used to identify graphene superlattices with a misalignment angle smaller than 2. © 2013 American Chemical Society.
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