Quantum Hall transport as a probe of capacitance profile at graphene edges

Ivan Vera Marun, I J Vera-Marun, P J Zomer, A Veligura, M H D Guimar??es, L Visser, N Tombros, H J van Elferen, U Zeitler, B J van Wees

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    Abstract

    The quantum Hall effect is a remarkable manifestation of quantized transport in a two-dimensional electron gas (2DEG). Given its technological relevance, it is important to understand its development in realistic nanoscale devices. In this work, we present how the appearance of different edge channels in a field-effect device is influenced by the inhomogeneous capacitance profile existing near the sample edges, a condition of particular relevance for graphene. We apply this practical idea to experiments on high quality graphene, demonstrating the potential of quantum Hall transport as a spatially resolved probe of density profiles near the edge of this two-dimensional electron gas.
    Original languageEnglish
    JournalApplied Physics Letters
    Volume102
    Issue number1
    DOIs
    Publication statusPublished - Jan 2013

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