title: Signatures of disorder in the minimum conductivity of graphene.
abstract: Graphene has been proposed as a promising material for future nanoelectronics because of its unique electronic properties. Understanding the scaling behavior of this new nanomaterial under common experimental conditions is of critical importance for developing graphene-based nanoscale devices. We present a comprehensive experimental and theoretical study on the influence of edge disorder and bulk disorder on the minimum conductivity of graphene ribbons. For the first time, we discovered a strong nonmonotonic size scaling behavior featuring a peak and saturation minimum conductivity. Through extensive numerical simulations and analysis, we are able to attribute these features to the amount of edge and bulk disorder in graphene devices. This study elucidates the quantum transport mechanisms in realistic experimental graphene systems, which can be used as a guideline for designing graphene-based nanoscale devices with improved performance.
authors.affiliation: School of Electrical and Computer Engineering, Purdue University , West Lafayette, Indiana 47907, United States. suiyang2000@gmail.com
authors.forename: Yang
authors.initials: Y
authors.lastname: Sui
authors.forename: Tony
authors.initials: T
authors.lastname: Low
authors.forename: Mark
authors.initials: M
authors.lastname: Lundstrom
authors.forename: Joerg
authors.initials: J
authors.lastname: Appenzeller