Kurt Stokbro, Mads Engelund, Anders Blom
We perform first-principles calculations of electron transport across a
nickel-graphene interface. Four different geometries are considered, where the
contact area, graphene and nickel surface orientations and the passivation of
the terminating graphene edge are varied. We find covalent bond formation
between the graphene layer and the nickel surface, in agreement with other
theoretical studies. We calculate the energy-dependent electron transmission
for the four systems and find that the systems have very similar edge contact
resistance, independent of the contact area between nickel and graphene, in
qualitative agreement with recent experimental data. Calculations for graphene
bonded with model surfaces show that the results are generic for strongly
bonded graphene surfaces, and the minimum attainable edge contact resistance is
twice the ideal edge quantum contact resistance of graphene.
View original:
http://arxiv.org/abs/1202.0171
No comments:
Post a Comment