Relativistic massless charged particles in a two-dimensional conductor can be guided by a one-dimensional electrostatic potential, in an analogous manner to light guided by an optical fiber. We use a carbon nanotube to generate such a guiding potential in graphene and create a single mode electronic waveguide. The nanotube and graphene are separated by a few nanometers and can be controlled and measured independently. As we charge the nanotube, we observe the formation of a single guided mode in graphene that we detect using the same nanotube as a probe. This single electronic guided mode in graphene is sufficiently isolated from other electronic states of linear Dirac spectrum continuum, allowing the transmission of information with minimal distortion.
@article{arxiv.1910.13307,
title = {Guiding Dirac fermions in graphene with a carbon nanotube},
author = {Austin Cheng and Takashi Taniguchi and Kenji Watanabe and Philip Kim and Jean-Damien Pillet},
journal= {arXiv preprint arXiv:1910.13307},
year = {2019}
}