1210.4987 (Yanjing Li et al.)

Tunneling Spectroscopy of Graphene using Planar Pb Probes    [PDF]

Yanjing Li, Nadya Mason

We show that evaporating lead (Pb) directly on graphene can create high-yield, high-quality tunnel probes, and we demonstrate high magnetic field/low temperature spectroscopy using these probes. Comparisons of Pb, Al and Ti/Au probes shows that after oxidation a well-formed self-limited tunnel barrier is created only between the Pb and the graphene. Tunneling spectroscopy using the Pb probes manifests energy-dependent features such as scattering resonances and localization behavior, and can thus be used to probe the microscopic electronics of graphene.

View original: http://arxiv.org/abs/1210.4987