Tunable Graphene Single Electron Transistor

Details Tunable Graphene Single Electron Transistor Tunable Graphene Single Electron Transistor

2008-06-09

arxiv.org/abs/0806.1475v1

Nano Lett. 8, 2378 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages and 5 figures

Scientific paper

We report electronic transport experiments on a graphene single electron transistor. The device consists of a graphene island connected to source and drain electrodes via two narrow graphene constrictions. It is electrostatically tunable by three lateral graphene gates and an additional back gate. The tunneling coupling is a strongly nonmonotonic function of gate voltage indicating the presence of localized states in the barriers. We investigate energy scales for the tunneling gap, the resonances in the constrictions and for the Coulomb blockade resonances. From Coulomb diamond measurements in different device configurations (i.e. barrier configurations) we extract a charging energy of 3.4 meV and estimate a characteristic energy scale for the constriction resonances of 10 meV.

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