Dependence of transport on adatom location for armchair-edge graphene nanoribbons

Abstract

We study the transport property for armchair-edge graphene nanoribbons (AGNRs) with an adatom coupling to a semi-infinite quantum wire. Using the nonequilibrium Green's function approach with tight-binding approximation, we demonstrate that the tunneling current through the system is sensitively dependent on both the AGNR width and adatom location. Interestingly, when the adatom locates onto a carbon atom in the 3$j$th chain from the edge of a metallic AGNR, the system shows a transmission gap accompanied by a threshold voltage in $I-V$ curve like a semiconducting AGNR. This effect may be useful in scanning tunneling microscopy experimental characterization on graphene samples.

3 pages, 4 figures

References in corpus (13)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• Energy Gaps in Graphene Nanoribbons
• Computational Study of Tunneling Transistor Based on Graphene Nanoribbon
• Molecular circuits based on graphene nano-ribbon junctions
• Effect of Edge Roughness on Electronic Transport in Graphene Nanoribbon Channel Metal Oxide Semiconductor Field-Effect Transistors
• Spectrum of $\pi$-electrons in Graphene As a Macromolecule
• Spectrum of $\pi$ Electrons in Graphene as an Alternant Macromolecule and Its Specific Features in Quantum Conductance
• Resonant Tunneling through double-bended Graphene Nanoribbons
• Unconventional scanning tunneling conductance spectra for graphene
• Local density of states and scanning tunneling currents in graphene
• Scanning Tunneling Microscopy currents on locally disordered graphene
• Control of electric current by graphene edge structure engineering

Cited by in corpus (1)

• Transport properties of armchair graphene nanoribbon junctions between graphene electrodes