title: Functionalized graphene as a model system for the two-dimensional metal-insulator transition.
abstract: Reports of metallic behavior in two-dimensional (2D) systems such as high mobility metal-oxide field effect transistors, insulating oxide interfaces, graphene, and MoS2 have challenged the well-known prediction of Abrahams, et al. that all 2D systems must be insulating. The existence of a metallic state for such a wide range of 2D systems thus reveals a wide gap in our understanding of 2D transport that has become more important as research in 2D systems expands. A key to understanding the 2D metallic state is the metal-insulator transition (MIT). In this report, we explore the nature of a disorder induced MIT in functionalized graphene, a model 2D system. Magneto-transport measurements show that weak-localization overwhelmingly drives the transition, in contradiction to theoretical assumptions that enhanced electron-electron interactions dominate. These results provide the first detailed picture of the nature of the transition from the metallic to insulating states of a 2D system.
authors: Naval Research Laboratory, Washington, DC, USA.
authors: M S
authors: MS
authors: Osofsky
authors: Naval Research Laboratory, Washington, DC, USA.
authors: S C
authors: SC
authors: Hernández
authors: George Mason University, Fairfax, VA, USA.
authors: A
authors: A
authors: Nath
authors: Naval Research Laboratory, Washington, DC, USA.
authors: V D
authors: VD
authors: Wheeler
authors: Naval Research Laboratory, Washington, DC, USA.
authors: S G
authors: SG
authors: Walton
authors: Naval Research Laboratory, Washington, DC, USA.
authors: C M
authors: CM
authors: Krowne
authors: Naval Research Laboratory, Washington, DC, USA.
authors: D K
authors: DK
authors: Gaskill