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 (NEGF) 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 3jth chain from the edge of a metallic AGNR, the system shows a transmission gap accompanied by a threshold voltage like a semiconducting AGNR. This effect may be useful in scanning tunneling microscopy experimental characterization on graphene samples.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
