Evidence of the role of contacts on the observed electron-hole asymmetry in graphene
Evidence of the role of contacts on the observed electron-hole asymmetry in graphene
We perform electrical transport measurements in graphene with several sample geometries. In particular, we design ``invasive'' probes crossing the whole graphene sheet as well as ``external'' probes connected through graphene side arms. The four-probe conductance measured between external probes varies linearly with charge density and is symmetric between electron and …