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Charge transport in topological graphene nanoribbons and nanoribbon heterostructures

Mark J. J. Mangnus1, Felix R. Fischer2,3,4, Michael F. Crommie3,4,5, Ingmar Swart1, and Peter H. Jacobse5

  • 1Debye Institute for Nanomaterials Science, Utrecht University, P.O. Box 80000, Utrecht, The Netherlands
  • 2Department of Chemistry, University of California, Berkeley, California 94720, USA
  • 3Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 4Kavli Energy NanoSciences Institute at the University of California Berkeley and the Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5Department of Physics, University of California, Berkeley, California 94720, USA

  • jacobse@berkeley.edu
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Phys. Rev. B 105, 115424 – Published 23 March, 2022

DOI: https://doi.org/10.1103/PhysRevB.105.115424

Abstract

Although it is generally accepted that structural parameters like width, shape, and edge structure crucially affect the electronic characteristics of graphene nanoribbons (GNRs), the exact relationship between geometry and charge transport remains largely unexplored. In this paper, we present in situ through-transport measurements of various topological GNRs and GNR heterostructures by lifting the ribbon with the tip of a scanning tunneling microscope. At the same time, we develop a comprehensive transport model that enables us to understand various features, such as obscuring of localized states in through transport, the effect of topology on transport, as well as negative differential conductance in heterostructures with localized electronic modes. The combined experimental and theoretical efforts described in this paper serve to elucidate general charge transport phenomena in GNRs and GNR heterostructures.

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Phys. Rev. B 105, 115424– Published 23 March, 2022
  • Received 12 May 2021
  • Revised 6 March 2022
  • Accepted 7 March 2022
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