Layer number determination in graphene using out-of-plane vibrations

Details Layer number determination in graphene using out-of-plane vibrations Layer number determination in graphene using out-of-plane vibrations

2012-03-27

arxiv.org/abs/1203.6043v2

Physics

Condensed Matter

Materials Science

Scientific paper

We present a double-resonant Raman mode in few-layer graphene, which is able to probe the number of graphene layers reliably. This so-called N mode on the low-frequency side of the G mode results from a double-resonant Stokes/anti-Stokes process combining a LO and a ZO' phonon. Simulations of the double-resonant Raman spectra in bilayer graphene show very good agreement with the experiments. The investigation of the out-of-plane ZO' phonon for layer number determination is expected to be transferable to other layered materials like boron nitride.

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