Unipolar transport is demonstrated in a bilayer graphene with a series of p-n junctions and is controlled by electrostatic biasing by a comb-shaped top gate. The OFF state is induced by multiple barriers in the p-n junctions, where the band gap is generated by applying a perpendicular electric field to the bilayer graphene, and the ON state is induced by the p-p or n-n configurations of the junctions. As the number of the junction increases, current suppression in the OFF state is pronounced. The multiple p-n junctions also realize the saturation of the drain current under relatively high source-drain voltages.
@article{arxiv.1203.6591,
title = {Unipolar transport in bilayer graphene controlled by multiple p-n interfaces},
author = {Hisao Miyazaki and Song-Lin Li and Shu Nakaharai and Kazuhito Tsukagoshi},
journal= {arXiv preprint arXiv:1203.6591},
year = {2012}
}
Comments
18 pages, 4 figures, Applied Physics Letters, in printing