We examined the conductance in metallic electrode/graphene/metallic electrode junctions, accounting for both the n- And the cr-bands of the graphene. Although the cr-band has been neglected in previous theoretical studies concerned with transport properties, we found that the cr-band of graphene significantly affects electrical transport. In our calculations, we used an atomistic tight-binding model and the Kubo-Landauer formula. The conductance values we obtained taking the cr-band of the graphene into account are three orders of magnitude larger than those obtained without considering the cr-band. The cr-band has a band gap at the Fermi level and does not affect conductance in bulk graphene, but it does indirectly hybridize with the rc-band of the graphene via metallic electrodes and contribute to conductance in junctions.
- ISSN : 0453-2198
- SCOPUS ID : 84978245690