title: Quantum dot behavior in graphene nanoconstrictions.
abstract: Graphene nanoribbons display an imperfectly understood transport gap. We measure transport through nanoribbon devices of several lengths. In long (>/=250 nm) nanoribbons we observe transport through multiple quantum dots in series, while shorter (</=60 nm) constrictions display behavior characteristic of single and double quantum dots. New measurements indicate that dot size may scale with constriction width. We propose a model where transport occurs through quantum dots that are nucleated by background disorder potential in the presence of a confinement gap.
authors.affiliation: Department of Physics and Department of Applied Physics, Stanford University, Stanford, California, 94305, USA.
authors.forename: Kathryn
authors.initials: K
authors.lastname: Todd
authors.forename: Hung-Tao
authors.initials: HT
authors.lastname: Chou
authors.forename: Sami
authors.initials: S
authors.lastname: Amasha
authors.forename: David
authors.initials: D
authors.lastname: Goldhaber-Gordon
mesh_terms: D003198:Computer Simulation; D003460:Crystallization / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D045663:Quantum Dots; D013499:Surface Properties
chemical_list: D046911:Macromolecular Substances; D006108:Graphite