Coherent transport in graphene nanoconstrictions

Details Coherent transport in graphene nanoconstrictions Coherent transport in graphene nanoconstrictions

2006-08-31

arxiv.org/abs/cond-mat/0608720v1

Phys. Rev. B74, 195417 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 9 figures

Scientific paper

10.1103/PhysRevB.74.195417

We study the effect of a structural nanoconstriction on the coherent transport properties of otherwise ideal zig-zag-edged infinitely long graphene ribbons. The electronic structure is calculated with the standard one-orbital tight-binding model and the linear conductance is obtained using the Landauer formula. We find that, since the zero-bias current is carried in the bulk of the ribbon, this is very robust with respect to a variety of constriction geometries and edge defects. In contrast, the curve of zero-bias conductance versus gate voltage departs from the $(2n+1) e^2/h$ staircase of the ideal case as soon as a single atom is removed from the sample. We also find that wedge-shaped constrictions can present non-conducting states fully localized in the constriction close to the Fermi energy. The interest of these localized states in regards the formation of quantum dots in graphene is discussed.

Affiliated with

Also associated with

No associations

Rating

Coherent transport in graphene nanoconstrictions does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Coherent transport in graphene nanoconstrictions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Coherent transport in graphene nanoconstrictions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-396762