We present atomistic calculations of quantum coherent electron transport through fulleropyrrolidine terminated molecules bridging a graphene nanogap. We predict that three difficult problems in molecular electronics with single molecules may be solved by utilizing graphene contacts: (1) a back gate modulating the Fermi level in the graphene leads facilitate control of the device conductance in a transistor effect with high on/off current ratio; (2) the size mismatch between leads and molecule is avoided, in contrast to the traditional metal contacts; (3) as a consequence, distinct features in charge flow patterns throughout the device are directly detectable by scanning techniques. We show that moderate graphene edge disorder is unimportant for the transistor function.
@article{arxiv.1108.4571,
title = {Graphene Nanogap for Gate Tunable Quantum Coherent Single Molecule Electronics},
author = {A. Bergvall and K. Berland and P. Hyldgaard and S. Kubatkin and T. Lofwander},
journal= {arXiv preprint arXiv:1108.4571},
year = {2013}
}