The use of two truly two-dimensional gapless semiconductors, monolayer and bilayer graphene, as current-carrying components in field-effect transistors (FET) gives access to new types of nanoelectronic devices. Here, we report on the development of graphene-based FETs containing two decoupled graphene monolayers manufactured from a single one folded during the exfoliation process. The transport characteristics of these newly-developed devices differ markedly from those manufactured from a single-crystal bilayer. By analyzing Shubnikov-de Haas oscillations, we demonstrate the possibility to independently control the carrier densities in both layers using top and bottom gates, despite there being only a nano-meter scale separation between them.
@article{arxiv.0809.5025,
title = {Tunable Graphene System with Two Decoupled Monolayers},
author = {H. Schmidt and T. Luedtke and P. Barthold and E. McCann and V. I. Falko and R. J. Haug},
journal= {arXiv preprint arXiv:0809.5025},
year = {2009}
}