Effects of electric field on topological phases in graphene nanoribbons

ORAL

Abstract

We have recently shown that graphene nanoribbons (GNRs) host distinct topological phases. By first-principles calculations and tight-binding methods, we demonstrated that GNRs of different width, edge shape and end terminations can belong to different topological classes characterized by a Z2 invariant. Electric field, on the other hand, is also an essential external element that can be used to tune the electronic properties of nanomaterials such as their band gaps. We thus carry out studies on the effects of electric field on the topological phases in various graphene nanoribbons by first-principles calculations.

*This work is supported by the National Science Foundation (NSF), the NSF Center for Energy Efficient Electronics Science, the Department of Energy, and the Office of Naval Research under the Muri Program. Computational resources have been provided by DOE at Lawrence Berkeley National Laboratory's NERSC facility.

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Presenters

  • Fangzhou Zhao

    • University of California, Berkeley
    • Physics Department, UC Berkeley and Lawrence Berkeley National Lab

Authors

  • Fangzhou Zhao

    • University of California, Berkeley
    • Physics Department, UC Berkeley and Lawrence Berkeley National Lab

  • 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

  • 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