Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-09-29
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Scientific paper
10.1016/j.physleta.2008.12.015
The contact conductance between graphene and two quantum wires which serve as the leads to connect graphene and electron reservoirs is theoretically studied. Our investigation indicates that the contact conductance depends sensitively on the graphene-lead coupling configuration. When each quantum wire couples solely to one carbon atom, the contact conductance vanishes at the Dirac point if the two carbon atoms coupling to the two leads belong to the same sublattice of graphene. We find that such a feature arises from the chirality of the Dirac electron in graphene. Such a chirality associated with conductance zero disappears when a quantum wire couples to multiple carbon atoms. The general result irrelevant to the coupling configuration is that the contact conductance decays rapidly with the increase of the distance between the two leads. In addition, in the weak graphene-lead coupling limit, when the distance between the two leads is much larger than the size of the graphene-lead contact areas and the incident electron energy is close to the Dirac point, the contact conductance is proportional to the square of the product of the two graphene-lead contact areas, and inversely proportional to the square of the distance between the two leads.
Li Haidong
Zheng Yisong
No associations
LandOfFree
Contact conductance between graphene and quantum wires 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 Contact conductance between graphene and quantum wires, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contact conductance between graphene and quantum wires will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-48870