In graphene, the extremely fast charge carriers can be controlled by electron-optical elements, such as waveguides, in which the transmissivity is tuned by the wavelength. In this work, charge carriers are guided in a suspended ballistic few-mode graphene channel, defined by electrostatic gating. By depleting the channel, a reduction of mode number and steps in the conductance are observed, until the channel is completely emptied. The measurements are supported by tight-binding transport calculations including the full electrostatics of the sample.
@article{arxiv.1509.02653,
title = {Guiding of Electrons in a Few Mode Ballistic Graphene Channel},
author = {Peter Rickhaus and Ming-Hao Liu and Péter Makk and Romain Maurand and Samuel Hess and Simon Zihlmann and Markus Weiss and Klaus Richter and Christian Schönenberger},
journal= {arXiv preprint arXiv:1509.02653},
year = {2015}
}