• Quantum capacitance of the armchair-edge graphene nanoribbon

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      https://www.ias.ac.in/article/fulltext/pram/081/02/0309-0317

    • Keywords

       

      Graphene electronics; finite-size effects; capacitance; quantization.

    • Abstract

       

      The quantum capacitance, an important parameter in the design of nanoscale devices, is derived for armchair-edge single-layer graphene nanoribbon with semiconducting property. The quantum capacitance oscillations are found and these capacitance oscillations originate from the lateral quantum confinement in graphene nanoribbon. Detailed studies of the capacitance oscillations demonstrate that the local channel electrostatic potential at the capacitance peak, the height and the number of the capacitance peak strongly depend on the width, especially a few nanometres, of the armchair-edge graphene nanoribbon. It implies that the capacitance oscillations observed in the experiments can be utilized to measure the width of graphene nanoribbon. The results also show that the capacitance oscillations are not seen when the width is larger than 30 nm.

    • Author Affiliations

       

      Ling-Feng Mao1

      1. School of Urban Rail Transportation & Institute of Intelligent Structure and System, Soochow University, Suzhou 215006, People’s Republic of China
    • Dates

       
  • Pramana – Journal of Physics | News

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