Inducing transport-anisotropy in graphene with 1D superlattices

Graphene devices subjected to one-dimensional periodic superlattice potential have been studied extensively over the last decade. Previous experimental studies on such systems interpreted their data in fundamentally different ways: either based on commensurate effects such as Fabry-Perot interference, or a band structure based picture. Here we exploit our recently developed technique of dielectric superlattices to pattern graphene with a 1D superlattice, with periodicity as low as as low as 55nm. We observe strong anisotropy in electrical transport features along directions parallel versus perpendicular to the SL basis vector. For transport parallel to the SL basis vector, we see features consistent with Fabry-Perot interference at zero magnetic field, and Hoftstader butterfly-like features at high field that suggest band structure modifications. Possible interplay between commensurability effects and band structure modifications in such systems are discussed.