Double Resonant Raman Scattering in Graphite

We find that the electronic dispersion in graphite gives rise to double resonant Raman scattering for excitation energies up to 5 eV. As we show, the curious excitation-energy dependence of the graphite $D$ mode is due to this double resonant process resolving a long-standing problem in the literature and invalidating recent attempts to explain this phenomenon. Our calculation for the $D$-mode frequency shift ( $60{\mathrm{cm}}^{\ensuremath{-}1}/\mathrm{eV}$) agrees well with the experimental value.

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