Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-05-02
Nanoscale Research Letters, 6, 253 (2011)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages, 4 figures
Scientific paper
10.1186/1556-276X-6-253
We present transport measurements on a strongly coupled graphene quantum dot in a perpendicular magnetic field. The device consists of an etched single-layer graphene flake with two narrow constrictions separating a 140 nm diameter island from source and drain graphene contacts. Lateral graphene gates are used to electrostatically tune the device. Measurements of Coulomb resonances, including constriction resonances and Coulomb diamonds prove the functionality of the graphene quantum dot with a charging energy of around 4.5 meV. We show the evolution of Coulomb resonances as a function of perpendicular magnetic field, which provides indications of the formation of the graphene specific 0th Landau level. Finally, we demonstrate that the complex pattern superimposing the quantum dot energy spectra is due to the formation of additional localized states with increasing magnetic field.
Ensslin Klaus
Frey Thomas
Guettinger J.
Ihn Thomas
Stampfer Christoph
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