A top-gated single wall carbon nanotube is used to define three coupled quantum dots in series between two electrodes. The additional electron number on each quantum dot is controlled by top-gate voltages allowing for current measurements of single, double and triple quantum dot stability diagrams. Simulations using a capacitor model including tunnel coupling between neighboring dots captures the observed behavior with good agreement. Furthermore, anti-crossings between indirectly coupled levels and higher order cotunneling are discussed.
@article{arxiv.0804.3441,
title = {A triple quantum dot in a single wall carbon nanotube},
author = {K. Grove-Rasmussen and H. I. Jørgensen and T. Hayashi and P. E. Lindelof and T. Fujisawa},
journal= {arXiv preprint arXiv:0804.3441},
year = {2008}
}
Comments
Supporting Information is available at Nano Lett. website (see link below)