heterostructures*

Vertical stacking of heterostructures that combine layered materials offer new ways of combining interesting properties of dissimilar electronic materials. Over the past few years we have been integrating graphene with complex-oxide heterostructures, specifically, the LaAlO₃/SrTiO₃ system. Furthermore, conducting nanostructures can be written under graphene, producing interesting interactions between the two systems. Here we report Coulomb drag measurements between single-layer graphene and a conductive LaAlO₃/SrTiO₃ interface. The observed Coulomb drag resistance is non-monotonic and increases for temperatures below 20 K. The temperature dependence is also non-monotonic, showing a notable departure from quadratic scaling, as expected from Fermi-liquid theory . Coulomb drag experiments between the graphene and LaAlO₃/SrTiO₃ layers show strong coupling in both the normal and superconducting state of the LaAlO₃/SrTiO₃.