We present and discuss a double-resonant Raman mode in few-layer graphene that is able to probe the number of graphene layers. This so-called N mode on the low-frequency side of the G mode results from a double-resonant Stokes--anti-Stokes process combining an longitudinal optical (LO) and an out-of-plane (ZO^') phonon. Simulations of the double-resonant Raman spectra in bilayer graphene show very good agreement with the experiments.
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Herziger et al. (2012) studied this question.
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