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Paper detail

Quantum transport in double-gated graphene devices

Double-gated graphene devices provide an important platform for understanding electrical and optical properties of graphene. Here we present transport measurements of single layer, bilayer and trilayer graphene devices with suspended top gates. In zero magnetic fields, we observe formation of pnp junctions with tunable polarity and charge densities, as well as a tunable band gap in bilayer graphene and a tunable band overlap in trilayer graphene. In high magnetic fields, the devices' conductance are quantized at integer and fractional values of conductance quantum, and the data are in good agreement with a model based on edge state equilibration at pn interfaces.

preprint2012arXivOpen access
J. Velasco Jr.Y. LeeL. JingG. LiuW. BaoC. N. Lau
cond-mat.mes-hall
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J. Velasco Jr.Y. LeeL. JingG. LiuW. BaoC. N. Lau

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