Direct Measurement of the Fermi Energy in Graphene Using a Double Layer Structure

Details Direct Measurement of the Fermi Energy in Graphene Using a Double Layer Structure Direct Measurement of the Fermi Energy in Graphene Using a Double Layer Structure

2011-12-22

arxiv.org/abs/1112.5467v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

We describe a technique which allows a direct measurement of the relative Fermi energy in an electron system using a double layer structure, where graphene is one of the two layers. We illustrate this method by probing the Fermi energy as a function of density in a graphene monolayer, at zero and in high magnetic fields. This technique allows us to determine the Fermi velocity, Landau level spacing, and Landau level broadening in graphene. We find that the $N=0$ Landau level broadening is larger by comparison to the broadening of upper and lower Landau levels.

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