Electronic properties of one-dimensional graphene bilayer ribbons

ORAL

Abstract

The electronic properties of armchair and zigzag bilayer graphene nanoribbons are studied using \textit{ab-initio} density functional theory. We study the effect of width and the electric fields (upto the dielectric breakdown field of SiO2) on their energy gaps [Sahu 2007]. We find metallic and semiconductor arm-chair ribbons and electric field has the effect of increasing the gap in metallic ribbons. The zigzag ribbons due to the edge magnetism show opposite behavior: gap decreases with increase in the applied electric field. We studied small ribbons (below 1 nm) as well as large ribbons (5 nm). In small width arm-chair semiconductor ribbons, the gap decreases whereas in the large width ribbons, the gap increases with applied electric field. Sahu B, Min H, MacDonald AH, and Banerjee SK ``Electronic properties of one-dimensional graphene bilayer ribbons'' (Submitted to Physical Review B).

*Work supported by NRI-SWAN Center

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Authors

  • Bhagawan Sahu

    • SWAN, Microelectronics Research Center
    • Microelectronics Research Center, University of Texas, Austin TX 78758

  • Hongki Min

    • University of Texas at Austin
    • Department of Physics, University of Texas, Austin, TX 78712
    • The University of Texas at Austin

  • Allan MacDonald

    • University of Texas at Austin
    • University of Texas
    • Dept. of Physics, Univ. of Texas at Austin
    • Department of Physics, University of Texas, Austin, TX 78712
    • Department of Physics, The University of Texas at Austin, Austin Texas 78712
    • The University of Texas at Austin
    • Department of Physics, University of Texas at Austin

  • Sanjay Banerjee

    • Microelectronics Research Center, Uniiversty of Texas at Austin, Austin, TX 78758
    • Department of ECE, The University of Texas at Austin