Schmidt, H. and Luedtke, T. and Barthold, P. and McCann, E. and Falko, Vladimir and Haug, R. J. (2008) Tunable graphene system with two decoupled monolayers. Applied Physics Letters, 93 (17): 172108. ISSN 1077-3118
Abstract
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 nanometer scale separation between them.