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.
| Original language | English |
|---|---|
| Article number | 115424 |
| Journal | Physical Review B |
| Volume | 105 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 23 Mar 2022 |
Bibliographical note
Funding Information:This paper was funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 (Nanomachine program: KC1203; development of GNR electronic structure formalism and simulations). Support was also provided by the Office of Naval Research under the MURI Program N00014-19-1-2596 (GNR lifting simulation) and the National Science Foundation under DMR-1839098 (image analysis). P.H.J. acknowledges fellowship support from the Dutch Research Council (NWO) through Rubicon Award No. 019.182EN.18. We acknowledge useful discussions with Daniel J. Rizzo, Juan Pablo Llinas, Joseph M. Thijssen, Zafer Mutlu, Franklin Liou, and Jeffrey Bokor.
Publisher Copyright:
© 2022 American Physical Society.
Funding
This paper was funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05-CH11231 (Nanomachine program: KC1203; development of GNR electronic structure formalism and simulations). Support was also provided by the Office of Naval Research under the MURI Program N00014-19-1-2596 (GNR lifting simulation) and the National Science Foundation under DMR-1839098 (image analysis). P.H.J. acknowledges fellowship support from the Dutch Research Council (NWO) through Rubicon Award No. 019.182EN.18. We acknowledge useful discussions with Daniel J. Rizzo, Juan Pablo Llinas, Joseph M. Thijssen, Zafer Mutlu, Franklin Liou, and Jeffrey Bokor.