Dual top gated graphene transistor in the quantum Hall regime

Details Dual top gated graphene transistor in the quantum Hall regime Dual top gated graphene transistor in the quantum Hall regime

2011-08-16

arxiv.org/abs/1108.3243v1

Solid State Communications, Volume 152, 545-548 (2012)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, supporting information at http"//www.tifr.res.in/~nano

Scientific paper

10.1016/j.ssc.2011.12.030

We study the effect of local modulation of charge density and carrier type in graphene field effect transistors using a double top gate geometry. The two top gates lead to the formation of multiple \emph{p-n} junctions. Electron transport measurements at low temperature and in the presence of magnetic field show various integer and fractionally quantized conductance plateaus. We explain these results based on the mixing of the edge channels and find that inhomogeneity plays an important role in defining the exact quantization of these plateaus, an issue critical for the metrology applications of \emph{p-n} junctions.

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