title: Ballistic Transport in Graphene Antidot Lattices.
abstract: The bulk carrier mobility in graphene was shown to be enhanced in graphene-boron nitride heterostructures. However, nanopatterning graphene can add extra damage and drastically degrade the intrinsic properties by edge disorder. Here we show that graphene embedded into a heterostructure with hexagonal boron nitride (hBN) on both sides is protected during a nanopatterning step. In this way, we can prepare graphene-based antidot lattices where the high mobility is preserved. We report magnetotransport experiments in those antidot lattices with lattice periods down to 50 nm. We observe pronounced commensurability features stemming from ballistic orbits around one or several antidots. Due to the short lattice period in our samples, we can also explore the boundary between the classical and the quantum transport regime, as the Fermi wavelength of the electrons approaches the smallest length scale of the artificial potential.
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg , D-93040 Regensburg, Germany.
authors.forename: Andreas
authors.initials: A
authors.lastname: Sandner
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg , D-93040 Regensburg, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Preis
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg , D-93040 Regensburg, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Schell
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg , D-93040 Regensburg, Germany.
authors.forename: Paula
authors.initials: P
authors.lastname: Giudici
authors.affiliation: National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Watanabe
authors.affiliation: National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Taniguchi
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg , D-93040 Regensburg, Germany.
authors.forename: Dieter
authors.initials: D
authors.lastname: Weiss
authors.affiliation: Institute of Experimental and Applied Physics, University of Regensburg , D-93040 Regensburg, Germany.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Eroms
keywords: Graphene; antidots; ballistic transport; boron nitride; nanopatterning