Hybrid functional devices based on graphene

Graphene has a great potential for implementation of tunable field effect devices with definite function for sensing, actuation and transduction. The accessible and surface-exposed 2D electron gas offered by graphene provides indeed an ideal platform on which to tune, via application of an electrostatic gate, the coupling between adsorbates deposited on its surface. This situation is particularly interesting when the network of adsorbates can induce some electronic order within the underlying graphene substrate, such as magnetic or superconducting correlations. 

We have experimentally studied the case of macroscopic graphene transistors decorated with an array of superconducting tin nanoparticles, which induce via percolation of proximity effect a global but tunable 2D superconducting state which critical temperature Tc can be tuned by gate voltage.  When quality of graphene is further increased, long range proximity effect can be reached leading to ballistic effects. I will show recent results of quantum interference in tin decorated graphene.