Tunable Short Periodic Superlattices in Graphene

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This project aims at an experimental demonstration of predicted superlattice effects in graphene modulated by a one-dimensional periodic potential. While two-dimensional superlattices have been studied experimentally by a number of groups, demonstrating, e.g., Hofstadter physics, one-dimensional superlattices should also lead to a strong modification of the graphene band structure, which has not yet been shown in experiment. Using high-mobility graphene embedded in boron nitride and patterned gates fabricated out of thin few-layer graphene, we will apply a short-period, tunable modulation potential to the transport layer, and study the resulting anisotropic band structure by magnetic focusing experiments, and the thermal damping of Shubnikov-de Haas oscillations. In addition, we will search for Bloch oscillations, umklapp electron-electron scattering and additional Landau levels predicted to exist in graphene with a strong 1D modulation.