Spatial Goos-Hanchen shift in photonic graphene

We present a theoretical study of the spatialGoos-Hanchen shift occurring at the interface between two photonic graphene lattices. Numerical simulations of light propagation in such a wave-guiding system are also presented to corroborate our findings. Our results show that the combined action of the honeycomb lattice structure and the discrete nature of wave-guiding systems give rise to a giant and negative Goos-Hanchen shift.