Effects of metallic contacts on electron transport through graphene

Details Effects of metallic contacts on electron transport through graphene Effects of metallic contacts on electron transport through graphene

2010-01-28

arxiv.org/abs/1001.5257v2

Phys. Rev. Lett. 104, 076807 (2010)

Physics

Condensed Matter

Materials Science

Accepted for publication in Physical Review Letters. (Fig. 1 became damaged during previous submission process. Fixed now.)

Scientific paper

10.1103/PhysRevLett.104.076807

We report on a first-principles study of the conductance through graphene suspended between Al contacts as a function of junction length, width, and orientation. The charge transfer at the leads and into the freestanding section gives rise to an electron-hole asymmetry in the conductance and in sufficiently long junctions induces two conductance minima at the energies of the Dirac points for suspended and clamped regions, respectively. We obtain the potential profile along a junction caused by doping and provide parameters for effective model calculations of the junction conductance with weakly interacting metallic leads.

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