We report the experimental realization of double quantum dots in single-walled carbon nanotubes. The device consists of a nanotube with source and drain contact, and three additional top-gate electrodes in between. We show that, by energizing these top-gates, it is possible to locally gate a nanotube, to create a barrier, or to tune the chemical potential of a part of the nanotube. At low temperatures we find (for three different devices) that in certain ranges of top-gate voltages our device acts as a double quantum dot, evidenced by the typical honeycomb charge stability pattern.
@article{arxiv.cond-mat/0605220,
title = {Defining and controlling double quantum dots in single-walled carbon nanotubes},
author = {M. R. Graeber and M. Weiss and C. Schoenenberger},
journal= {arXiv preprint arXiv:cond-mat/0605220},
year = {2009}
}