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Abstract
Graphene is the two-dimensional building block for carbon allotropes of every other
dimensionality. We show that its electronic structure is captured in its Raman spectrum
that clearly evolves with the number of layers. The D peak second order changes in
shape, width, and position for an increasing number of layers, reflecting the change
in the electron bands via a double resonant Raman process. The G peak slightly down-shifts.
This allows unambiguous, high-throughput, nondestructive identification of graphene
layers, which is critically lacking in this emerging research area.