Importance of exciton-phonon coupling in optical spectroscopy of 2D materials

It is well established that excitonic effects dominate the absorption and luminescence spectra of many 2D materials. It can thus be expected that in vibrational spectroscopy of 2D materials the coupling of phonons with excitons, rather than with independent electrons or holes, should be taken into account. We present a theory and computational implementation for resonant Raman scattering based on exciton-phonon couplings. The method has been applied to different materials and allows for an intuitive interpretation of the energy dependence of the Raman intensities.

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