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In this work we probe the third-order non-linear optical property ofgraphene, hexagonal boron nitride and their heterostructure by the use ofcoherent anti-Stokes Raman Spectroscopy. When the energy difference of the twoinput fields match the phonon energy, the anti-Stokes emission intensity isenhanced in h-BN, as usually expected while for graphene a anomalous decreaseis observed. This behaviour can be understood in terms of q coupling betweenthe electronic continuum and a discrete phonon state. We have also measured agraphene/h-BN heterostructure and demonstrate that the anomalous effect ingraphene dominates the heterostructure optical response.

Anomalous Non-linear Optical Response Of Graphene Near Phonon Resonances