STM Characterization of Metallic Graphene Nanoribbons

ORAL

Abstract

Graphene nanoribbons (GNRs) are narrow strips of graphene that can host a wide range of 1-dimensional phenomena, including non-trivial topology and magnetism. The advent of molecule-based bottom-up synthesis techniques has enabled GNR properties to be tuned via the precise placement of individual carbon atoms. Realization of robust metallicity in bottom-up GNRs, however, remains elusive. The ability to engineer the frontier band structure of GNRs via hybridization of topologically-protected interface states suggests a strategy for inducing GNR metallicity by symmetrizing the hopping between adjacent interface states. Using this approach we have realized metallic GNR superlattices that are gapless by virtue of the symmetric placement of π-radical states along the GNR backbone. Scanning tunneling microscopy and spectroscopy (STM/STS) performed in conjunction with first-principles calculations confirms that these GNR superlattices possess a non-zero density of states (DOS) through EF, a hallmark of metallicity. Strategies for increasing the bandwidth of metallic GNRs will be discussed.

*Office of Naval Research MURI Program N00014-16-1-2921
U.S. Department of Energy (DOE) no. DE-SC0010409 and no. DE-AC02-05CH11231
NSF Award 0939514
National Science Foundation DMR-1508412

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Presenters

  • Daniel J Rizzo

    • Physics, University of California - Berkeley

Authors

  • Daniel J Rizzo

    • Physics, University of California - Berkeley

  • Gregory Veber

    • Chemistry, UC Berkeley
    • Chemistry, University of California - Berkeley

  • Jingwei Jiang

    • Physics, UC Berkeley
    • Physics, University of California - Berkeley

  • Christopher Bronner

    • Physics, UC Berkeley
    • Physics, University of California - Berkeley

  • Ting Chen

    • Physics, University of California - Berkeley

  • Steven G. Louie

    • Physics, UC Berkeley
    • University of California, Berkeley
    • Department of Physics, University of California, Berkeley
    • Physics Department, UC Berkeley and Lawrence Berkeley National Lab
    • Department of Physics, University of California at Berkeley and Materials Sciences Division, Lawrence Berkeley National Laboratory
    • Physics, University of California at Berkeley
    • University of California at Berkeley and Lawrence Berkeley National Lab
    • University of California at Berkeley and Lawrence Berkeley National Laboratory
    • Physics, University of California, Berkeley
    • UC Berkeley and Lawrence Berkeley National Lab
    • Physics, University of California - Berkeley
    • Physics and Materials Sciences, University of California at Berkeley and Lawrence Berkeley National Laboratory
    • Lawrence Berkeley National Lab and University of California, Berkeley
    • University of California - Berkeley, Lawrence Berkeley National Laboratory

  • Felix R Fischer

    • Chemistry, UC Berkeley
    • Chemistry, University of California - Berkeley

  • Michael F Crommie

    • Physics, UC Berkeley
    • University of California, Berkeley
    • Lawrence Berkeley National Laboratory and UC Berkeley
    • Department of Physics, University of California at Berkeley
    • Physics, University of California - Berkeley