title: Anisotropic quantum transport in a network of vertically aligned graphene sheets.
abstract: Novel anisotropic quantum transport was observed in a network of vertically aligned graphene sheets (VAGSs), which can be regarded as composed of plenty of quasi-parallel, nearly intrinsic, freestanding monolayers of graphene. When a magnetic field was perpendicular to most graphene sheets, magnetoresistance (MR) curves showed a weak localization (WL) effect at low field and a maximum value at a critical field ascribed to diffusive boundary scattering. While the magnetic field was parallel to the graphene sheets, the MR maximum disappeared and exhibited a transition from WL to weak antilocalization (WAL) with increasing temperature and magnetic field. Edges as atomically sharp defects are the main elastic and inelastic intervalley scattering sources, and inelastic scattering is ascribed to electron-electron intervalley scattering in the ballistic regime. This is the first time simultaneously observing WL, WAL and diffusive boundary scattering in such a macroscopic three-dimensional graphene system. These indicate the VAGS network is a robust platform for the study of the intrinsic physical properties of graphene.
authors.affiliation: Research & Development Center for Functional Crystals, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing, People's Republic of China.
authors.forename: J
authors.initials: J
authors.lastname: Huang
authors.forename: L-W
authors.initials: LW
authors.lastname: Guo
authors.forename: Z-L
authors.initials: ZL
authors.lastname: Li
authors.forename: L-L
authors.initials: LL
authors.lastname: Chen
authors.forename: J-J
authors.initials: JJ
authors.lastname: Lin
authors.forename: Y-P
authors.initials: YP
authors.lastname: Jia
authors.forename: W
authors.initials: W
authors.lastname: Lu
authors.forename: Y
authors.initials: Y
authors.lastname: Guo
authors.forename: X-L
authors.initials: XL
authors.lastname: Chen