Using ab-initio methods we investigate the possibility of three-terminal graphene "T-junction" devices and show that these all-graphene edge contacts are energetically feasible when the 1D interface itself is free from foreign atoms. We examine the energetics of various junction structures as a function of the atomic scale geometry. Three-terminal equilibrium Green's functions are used to determine the transmission spectrum and contact resistance of the system. We find that the most symmetric structures have a significant binding energy, and we determine the contact resistances in the junction to be in the range of 1-10 kOhm which is comparable to the best contact resistance reported for edge-contacted graphene-metal contacts. We conclude that conducting all-carbon T-junctions should be feasible.
@article{arxiv.1601.07708,
title = {All-graphene edge contacts: Electrical resistance of graphene T-junctions},
author = {Kåre Wedel Jacobsen and Jesper Toft Falkenberg and Nick Papior and Peter Bøggild and Antti-Pekka Jauho and Mads Brandbyge},
journal= {arXiv preprint arXiv:1601.07708},
year = {2016}
}