Evidence for incompressible states in a metal graphene tunnel junction in high magnetic field

Details Evidence for incompressible states in a metal graphene tunnel junction in high magnetic field Evidence for incompressible states in a metal graphene tunnel junction in high magnetic field

2011-08-18

arxiv.org/abs/1108.3823v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

12 pages, 3 figures

Scientific paper

10.1103/PhysRevB.84.121408

We present transport measurements of tunnel junctions made between Cu and graphene in a magnetic field. We observe a transition to a Landau level like structure at high fields, as well as a set of sharp features in the tunneling spectra that shift with gate and tunnel probe voltage along the lines of constant charge density. We explain the sharp features with the formation of degeneracy split localized Landau levels, and addition of electrons to those levels one by one. A large capacitive coupling to the tunnel probe also increases the gate voltage spacing between the Landau levels.

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