title: Gate-defined graphene quantum point contact in the quantum Hall regime.
abstract: We investigate transport in a gate-defined graphene quantum point contact in the quantum Hall regime. Edge states confined to the interface of p and n regions in the graphene sheet are controllably brought together from opposite sides of the sample and allowed to mix in this split-gate geometry. Among the expected quantum Hall features, an unexpected additional plateau at 0.5h/e2 is observed. We propose that chaotic mixing of edge channels gives rise to the extra plateau.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: S
authors.initials: S
authors.lastname: Nakaharai
authors.forename: J R
authors.initials: JR
authors.lastname: Williams
authors.forename: C M
authors.initials: CM
authors.lastname: Marcus