Gate-Defined Graphene Quantum Point Contact in the Quantum Hall Regime

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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 0.5 h/e² is observed. We propose that chaotic mixing of edge channels gives rise to the extra plateau.