Interface states and anomalous quantum oscillations in graphene hybrid structures

Abstract

One- and two-layer graphene have recently been shown to feature new physical phenomena such as unconventional quantum Hall effects and prospects of supporting a non-silicon technological platform using epitaxial graphene. While both one- and two-layer graphene have been studied extensively, continuous sheets of graphene possessing both parts have not yet been explored. Here we report a study of such graphene hybrid structures. In a bulk hybrid featuring two large-area one- and two-layer graphene and an interface between them, two sets of Landau levels and features related to the interface were found. In edge hybrids featuring a large two-layer graphene with narrow one-layer graphene edges, we observed an anomalous suppression in quantum oscillation amplitude due to the locking of one- and two-layer graphene Fermi energies and emergent chiral interface states. These findings demonstrate the importance of these hybrid structures whose unique interface states and related phenomena deserve further studies.

4 pages, 4 figures

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Cited by in corpus (12)

• Photo-Thermoelectric Effect at a Graphene Interface Junction
• Unconventional Sequence of Fractional Quantum Hall States in Suspended Graphene
• Electronic and optical properties of graphene nanoribbons in external fields
• Quantum Hall Effects in Monolayer-Bilayer Graphene Planar Junctions
• Spatially resolving unconventional interface Landau quantization in a graphene monolayer-bilayer planar junction
• Quantum transport across van der Waals domain walls in bilayer graphene
• Magnetoelectronic and optical properties of nonuniform graphene nanoribbons
• Electric-field induced penetration of edge states at the interface between monolayer and bilayer graphene
• Isolated and hybrid bilayer graphene rings
• Edge States at the Interface between Monolayer and Bilayer Graphene
• Transmission across a bilayer graphene region
• Supercurrent reversal in Josephson junctions based on bilayer graphene flakes