Graphene quantum dots in perpendicular magnetic fields

Details Graphene quantum dots in perpendicular magnetic fields Graphene quantum dots in perpendicular magnetic fields

2009-05-15

arxiv.org/abs/0905.2567v1

Physica Status Solidi B 246, No. 11, 2553 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures, submitted to pss-b

Scientific paper

10.1002/pssb.200982312

We report transport experiments on graphene quantum dots. We focus on excited state spectra in the near vicinity of the charge neutrality point and signatures of the electron-hole crossover as a function of a perpendicular magnetic field. Coulomb blockade resonances of a 50 nm wide and 80 nm long dot are visible at all gate voltages across the transport gap ranging from hole to electron transport. The magnetic field dependence of more than 40 states as a function of the back gate voltage can be interpreted in terms of the unique evolution of the diamagnetic spectrum of a graphene dot including the formation of the E = 0 Landau level, situated in the center of the transport gap, and marking the electron-hole crossover.

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