Metallic graphene nanoribbons with tunable bandwidth and magnetic properties

ORAL

Abstract

It is known that 7-armchair graphene nanoribbon(AGNR) holds topological end states at its zigzag ends. A superlattice with such end states is predicted to give rise to in-gap bands whose energies differ from the bulk states’ significantly, which will form a well-isolated subspace. Utilizing these characters of the topological states, we develop a novel AGNR superlattice that possesses two zigzag edges per unit cell. We further show using first principle calculations that, by modifying the geometry of such GNRs, it is possible to get metallic GNRs with tunable bandwidth. Explicitly, the occurrence of five-membered rings would change the bandwidth drastically. After including substrate effects, we reach good agreement with experimental results. In addition, we predict that one of the structures would have ferrimagnetic orders based on Lieb’s theorem and confirmed by density functional theory (DFT) calculation.

*This work is supported by the NSF, DOE, and Office of Naval Research under MURI program, and computational resources from NERSC and XSEDE.

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Presenters

  • Ting Chen

    • Physics, UC Berkeley

Authors

  • Jingwei Jiang

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

  • Ting Cao

    • Physics, UC Berkeley
    • University of California, Berkeley
    • Physics Department, UC Berkeley and Geballe Laboratory for Advanced Materials, Stanford University
    • Physics Department at UC Berkeley and Geballe Laboratory for Advanced Materials at Stanford University
    • Geballe Laboratory for Advanced Materials, Stanford University

  • Daniel Rizzo

    • Physics, UC Berkeley

  • Gregory Veber

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

  • Christopher Bronner

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

  • Ting Chen

    • Physics, UC Berkeley

  • 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

  • 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